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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.

 - getRelayInfo() implemented, relay_ is now protected
 - setRelay => setRelayInfo
 - Option::Universe is passed as const reference
 - Further clarified white_list_ field in Subnet.h

 - 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

 - Copyright years updated
 - Minor corrections in BINDX Guide
 - dhcp4.spec relay structure description updated.
 - new unit-test for DHCPv4 client classification added
 - new unit-test for DHCPv6 client classification added
 - fixed Doxygen errors
 - comments for CfgMgr::getSubnet{4,6} updated

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.

Removed configuration parameter allow-client-update.
It was deemed to really just be the inverse of override-client-update.
Renamed convenience method isDhcpDdns to ddnsEnabled.
Made enum to string converion functions case insenstive.
Updated copyright dates and other cosmetic changes.

Added configuration paramters to dhcp4 and its spec file to support DHCP-DDNS.
Created new classes D2ClientMgr, D2ClientConfig, and D2CientConfigParser in the
libdhcpsrv.   The new parameters are parsed, validated, and stored  but do
not yet affect behavior.  That will be implemented as a seperate ticket.

 - config parsers updated
 - new unit-tests for vendor options written
 - libdhcp++ cleaned up
 - fixes in option_vendor.cc
 - comments added and cleaned up

This commit also changes the ParserContext copy constructor and assignment
operator to handle copying of the NULL shared pointers.