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The interface-config map will hold the "interfaces" list which used to
be a global parameter. The new configuration layout is incompatible with
a previous layout.

 - Moved MAC operations to a new CfgMACSource class
 - Moved macros to HWaddr class
 - Added several unit-tests for MAC sources
 - MAC extraction code moved to separate function in Dhcpv6Srv

Also added some more unit tests for csv-format parameter.

Also, changed internals of the OptionDataParser:
- option parameters are validated in distnict functions to make code more
readable
- option data values are optional

This change affects many files using the Configuration object and types
derived from it.

Removed unused template parameter from functions in dhcp_parsers test.

The unit test didn't correctly check that the configuration file name
hasn't changed when the configuration context was copied.

Added checks in D2ClientCfg to make user server and
sender ip values are the same family, and that
the server ip/port is not exactly the same as the
sender ip/port.

Adding new members to D2ClientConfig
- sender_ip
- sender_port
- max_queue_size

Modified D2ClientConfigParser to parse the new values
Modified D2ClientMgr to make use of the new values
Updated the appropriate unittests

Added the constant D2ClientConfig::DFT_ALWAYS_INCLUDE_FQDN

Added a method to ValueType<> template, getOptionalParam.
Defined constants for dhcp-ddns default values in D2ClientConfig.
D2ClientConfigParser uses these in conjuction with calls to
ValueType<>getOptionalParam() to ensure all the parameters needed
have values.
Modifed unit tests accordingly.

 - RelayInfoParser now takes Option::Universe as last parameter;
 - Extra tests for checking invalid parameters in RelayInfoParser
 - Comments in subnet.h improved
 - Sanity checks in RelayInfoParser implemented, doc improved

Most notable change is the removeal of the remove-on-renew
configuration parameter.  Other changes were to commentary
or minor code improvements.

D2CLientConfigParser now supports parsing all parameters even if
enable-updates is false.  This allows values like generated-prefix
and qualifying-suffix to be used even if udpates are turned off.
The parser still supports an abbreviated dhcp-ddns entry that has only
enable-updates defined as false.