[#2909] Migrated v6 addresses to inet

[#2909] Migrated v6 addresses to inet

src/share/database/scripts/pgsql/upgrade_016_to_017.sh.in
    New file

configure.ac
    Added new upgrade file

src/bin/admin/tests/pgsql_tests.sh.in
    Updated tests

src/lib/dhcpsrv/pgsql_host_data_source.cc
    Modified SQL to convert ipv6_reservations.address to/from inet

src/lib/dhcpsrv/pgsql_lease_mgr.*
    Modified SQL to convert lease6.address to/from inet
    Removed binaddr column
    Removed PgSqlLeaseMgr::upgradeBinaryAddress6()

src/lib/pgsql/pgsql_connection.h
    Updated schema version

src/share/database/scripts/pgsql/dhcpdb_create.pgsql
    Altered lease6,ipv6_reservastions table
    Updated v6 dump and upload functions