[#3848] Detect authentication risks

[#3848] Detect authentication risks

Throw or Warn if API end points do not use some form
of authentication

Throw or Warn if 'user', 'password' - API end points
Throw or Warn if 'secret' is used  - TSIG

Disable/enable security for UTs as needed

modified:   src/bin/agent/tests/ca_cfg_mgr_unittests.cc
modified:   src/bin/agent/tests/ca_response_creator_unittests.cc
modified:   src/bin/agent/tests/get_config_unittest.cc
modified:   src/bin/d2/tests/d2_cfg_mgr_unittests.cc
modified:   src/bin/d2/tests/d2_command_unittest.cc
modified:   src/bin/d2/tests/d2_controller_unittests.cc
modified:   src/bin/d2/tests/d2_http_command_unittest.cc
modified:   src/bin/d2/tests/d2_process_unittests.cc
modified:   src/bin/d2/tests/d2_simple_parser_unittest.cc
modified:   src/bin/d2/tests/get_config_unittest.cc
modified:   src/bin/dhcp4/tests/config_parser_unittest.cc
modified:   src/bin/dhcp4/tests/dhcp4_srv_unittest.cc
modified:   src/bin/dhcp4/tests/dhcp4_test_utils.cc
modified:   src/bin/dhcp4/tests/get_config_unittest.cc
modified:   src/bin/dhcp4/tests/get_config_unittest.cc.skel
modified:   src/bin/dhcp4/tests/http_control_socket_unittest.cc
modified:   src/bin/dhcp6/tests/config_parser_unittest.cc
modified:   src/bin/dhcp6/tests/dhcp6_srv_unittest.cc
modified:   src/bin/dhcp6/tests/dhcp6_test_utils.cc
modified:   src/bin/dhcp6/tests/get_config_unittest.cc
modified:   src/bin/dhcp6/tests/get_config_unittest.cc.skel
modified:   src/bin/dhcp6/tests/http_control_socket_unittest.cc
modified:   src/lib/config/tests/http_command_config_unittests.cc
modified:   src/lib/d2srv/d2_config.cc
modified:   src/lib/d2srv/d2_messages.cc
modified:   src/lib/d2srv/d2_messages.h
modified:   src/lib/d2srv/d2_messages.mes
modified:   src/lib/http/auth_messages.cc
modified:   src/lib/http/auth_messages.h
modified:   src/lib/http/auth_messages.mes
modified:   src/lib/http/basic_auth_config.cc
modified:   src/lib/http/tests/basic_auth_config_unittests.cc
modified:   src/lib/testutils/dhcp_test_lib.sh.in