[#101,!58] Implemented ConfigBackendDhcp4Mgr, mysql backend registers/unregisters

src/hooks/dhcp/mysql_cb/mysql_cb_callouts.cc
    load() - added call to register MySQL backend
    unload() - added call to unregister MySQL backend

src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.*
    MySqlConfigBackendDHCPv4::registerBackendType()
    MySqlConfigBackendDHCPv4::unregisterBackendType()
    - new static methods for registering/unregistering

src/hooks/dhcp/mysql_cb/tests/Makefile.am
    mysql_cb_dhcp4_mgr_unittest.cc  - new file

src/lib/config_backend/base_config_backend_mgr.h
    bool unregisterBackendFactory(const std::string& db_type)
    - new method to unregister factory and delete backends

src/lib/config_backend/base_config_backend_pool.h
    void delAllBackends(const std::string& db_type)
    - new method to delete all backends of a given type

/src/lib/config_backend/tests/config_backend_mgr_unittest.cc
    TEST_F(ConfigBackendMgrTest, unregister) - new test

src/lib/dhcpsrv/Makefile.am
src/lib/dhcpsrv/config_backend_dhcp4.h
src/lib/dhcpsrv/config_backend_dhcp4.cc
    New files that implement ConfigBackendDhcp4Mgr

src/lib/dhcpsrv/config_backend_pool_dhcp4.h
    Added missing public scope, removed pure virtual function

src/lib/eval/tests/Makefile.am
    Added new dependency libkea-cc

Update AUTHORS

[147-pid-files-dir-error] dhcp_data_dir added to Makefile.am

[master] Added swig in netconf dependencies

[master] Removed accidentally committed files.

Reviewed by Wlodek.

[154-netconf-disable-reload] Added processSignal redefine

[#93,!56] Delete methods must return number of affected rows.

[#93,!56] Addressed review comments.

[#93,!56] Updated MySQL config backend to manage global parameters.

[#93,!56] Implemented StampedValue.

[#93,!51] Used buffer length constants in mysql cb impl.

[#93,!51] Removed accidentally inserted characters.

[#93,!51] Fixed compilation issue in Config Backend pool.

[#93,!51] Enclose option creation in transactions.

[#93,!51] Fixed MySQL upgrade unit test.

[#93,!51] Added config backend constants with buffer lengths.

[#93,!51] Addressed review comments.

[#93,!51] Rebased !51 against !35.

[#93,!51] Pool specific options are now managed in MySQL database.

[#93,!51] Fetching global options is now possible.

[#93,!51] Added options management in MySQL DHCPv4 config backend.

[#93,!35] Removed extra dist causing mysql_cb build to fail.

[#93,!35] Shared network name is now associated with subnet.

[#93,!35] Optimize update queries for shared networks and subnets.

[#93,!35] Enclose subnet/network creation in transaction.

[#93,!35] Check results of the delete operations.

[#93,!35] Config Backend API returns number of deleted entries.

[#93,!35] Check for binding errors in the MySqlConnection class.

[#93,!35] Added missing column in MySQL upgrade script.

[#93,!35] Addressed minor and refectoring issues.

[#93,!35] Removed spurious letter in Makefile.am

[#93,!35] Commented another unused variable.

[#93,!35] Tempoarily commented out unused parameters.

[#93,!35] Removed spurious whitespace.

[#93,!35] Changed option def code from tinyint to smallint.

[#93,!35] Moved common CB functions to a parent class.

[#93,!35] Added deletion of subnets, networks and option defs in MySQL CB.

[#93,!35] Implemented fetching option definitions from the database.

[#93,!35] Updated DHCPv4 Config Backend to insert and fetch shared network.

[#93,!35] Pools are stored with IPv4 subnets.

[#93,!35] Implemented subnet fetching in MySQL Config Backend.

[#93,!35] Extended MySqlConnection with generic query functions.

[#93] Added mysql_cb hooks library.

[master] Fixed distcheck broken by #32,!23

    Corrected filenames in lib/process/Makefile.am

[master] Install new header yang_models.h

[128-netconf-config] Addressed comments

[128-netconf-config] Added netconf config code from kea-yang

[65-libyang-pool_rebased] Rebase on last master before merge

[65-libyang-pool] Addressed comments and updated base code

[#65,!44] Minor changes after review.

[#65,!44] yang_models.h added.

[master] Added ChangeLog entry 1456.

[master] kea-dhcp4/6 now parser "server-tag" and "config-control"

    Merge branch '32-extend-dhcp-configuration-to-point-to-the-config-backend'

[#32,!23] Fixed doxygen issue

src/lib/process/config_ctl_info.h
    Added code/endcode around JSON

[#32, !23] Addressed review comments

[#32,!23] - Added server-tag global to SrvConfig and kea-dhcp4/6

src/bin/dhcp4/dhcp4_lexer.ll
src/bin/dhcp4/dhcp4_parser.yy
src/bin/dhcp4/json_config_parser.cc
    added server-tag

src/bin/dhcp4/tests/config_parser_unittest.cc
    TEST_F(Dhcp4ParserTest, serverTag) - new test

src/bin/dhcp6/dhcp6_lexer.ll
src/bin/dhcp6/dhcp6_parser.yy
src/bin/dhcp6/json_config_parser.cc
    added server-tag

src/bin/dhcp6/tests/config_parser_unittest.cc
    TEST_F(Dhcp6ParserTest, serverTag)

src/lib/dhcpsrv/parsers/simple_parser4.cc
src/lib/dhcpsrv/parsers/simple_parser6.cc
    Added server-tag to global defaults

src/lib/dhcpsrv/srv_config.cc
    Added server_tag_ memger to SrvConfig

src/lib/dhcpsrv/tests/srv_config_unittest.cc
    TEST_F(SrvConfigTest, serverTag)
    TEST_F(SrvConfigTest, unparseConfigControlInfo6) - new tests

[#32,!23] dhcp6 now parses "config-control" element

[#32,!23] Updated dhcp4/tests/get_config_unitttest.cc

    Updated generated config tests for dhcp4

[#32,!23] dhcp4 now parses "config-control" element

src/bin/dhcp4/dhcp4_lexer.ll
src/bin/dhcp4/dhcp4_parser.yy
    Added parsing support for config-control and config-databases

src/bin/dhcp4/json_config_parser.cc
    configureDhcp4Server() - added handler for config-control element

src/bin/dhcp4/parser_context.*
    added CONFIG_CONTROL and CONFIG_DATABASE

src/bin/dhcp4/tests/config_parser_unittest.cc
   TEST_F(Dhcp4ParserTest, configControlInfo) - new test

[#32,!23] SrvConfig::toElement now outputs config-control

src/lib/dhcpsrv/srv_config.cc
    SrvConfig::toElement() - added logic to output config-control

src/lib/dhcpsrv/tests/srv_config_unittest.cc
    TEST_F(SrvConfigTest, unparseConfigControlInfo) - new test

[#32,!23] Added storage of ConfigControlInfo to process:ConfigBase

    ConfigBase now houses ConfigControlInfo
    Relocated ConfigControl from libconfig to libprocess

[#32,!23] Added ControlConfigParser to lib/config

src/lib/config/config_ctl_parser.*
    - new files implementing ControlConfigParser

src/lib/config/Makefile.am
    - added new files

src/lib/config/tests/config_ctl_parser_unittests.cc
    - new file which tests new parser

src/lib/config/tests/Makefile.am
    - added new file

[#32,!23] Added ControlConfigInfo to lib/config

src/lib/config/config_ctl_info.*
    New files, implementing ConfigDbInfo and ConfigControlInfo
    classes use for housing configuration backend and control
    information

src/lib/config/Makefile.am
    Added config_ctl_info.h/cc
    Added libkea-database.la

src/lib/config/tests/config_ctl_info_unitests.cc
    New file which unit tests new classes

src/lib/database/database_connection.*
    DatabaseConnection::toElement(const ParameterMap& params) - new
    static function which turns a parameter map into Elements

    DatabaseConnection::toElementDbAccessString(const std::string& dbaccess)
    - new static function which turns an access string into Elements

src/lib/database/dbaccess_parser.*
    Replaced StringPairMap with DatabaseConnection::ParameterMap

src/lib/database/tests/database_connection_unittest.cc
    TEST(DatabaseConnection, toElementDbAccessStringValid)
    TEST(DatabaseConnection, toElementDbAccessStringInvalid)
    TEST(DatabaseConnection, toElementDbAccessStringEmpty) - new tests

src/lib/dhcpsrv/cfg_db_access.*
    CfgDbAccess::toElementDbAccessString() - moved to
    lib/database/database_connection.cc so it can be shared

[128-netconf-use-libprocess] Final update before merge

[128-netconf-use-libprocess] Addressed last comments

[128-netconf-use-libprocess] Addressed comments (remove code option)

[#128,!50] Updated .gitignore

[128-netconf-use-libprocess] Updated after CPL merge

[128-netconf-use-libprocess_rebased] Resolved rebase conflicts

[6-simplify-cpl] Fixed cut&paste: Control Agent -> DHCP-DDNS server

[6-simplify-cpl] Removed #if 0 enclosed code

[#6,!54] Removed DCfgContextBase class.

[#6,!54] More code removed from lib/process

[#6,!54] Obsolete code removed.

[5-netconf-config] Cleaned Makefiles

[#5,!49] Rename Control-Netconf => Netconf

[#5,!49] Added DHCPv4-specific netconf example config.

[5-netconf-config] Final fixes

[#,5!49], regen bison

[5-netconf-config] Updated examples and twist global objects

[#,5!49], regen flex/bison

[5-netconf-config] Updated syntax

[5-netconf-config] regen flex/bison

[5-netconf-config] Added netconf syntax

[65-libyang-pool] Addressed rebase conflicts

[65-libyang-pool_rebased] Addressed rebase conflicts

[65-libyang-option-def_rebased] Rebasing before merge

[128-netconf-use-libprocess] Adopted runIO() which of course will be extended

[128-netconf-use-libprocess] Adopted runIO() which of course will be extended

[128-netconf-use-libprocess] Added use of libprocess in netconf

[65-libyang-config-build_rebased] Rebasing on last master

[65-libyang-config-build] Merge branch '65-libyang-config-build' of gitlab.isc.org:isc-projects/kea into 65-libyang-config-build

[65-libyang-config-build] Moved daemon required test at the end

[65-libyang-config-build] Added uses of SYSREPO_REPO

[65-libyang-config-build] Updated configure and top Makefile

[134-bugs--xcode-10] Ignore unused private fields (first one looked like a false positive)

[65-libyang-option-def_rebased] Rebasing on last master

[65-libyang-pool] Fixed doxygen comments

[65-libyang-pool] Fixed doxygen comments

[65-libyang-option-def] Fixed doxygen comments