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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.

d2_client.h and .cc was split into four files:

D2ClientConfig class is now in d2_client_cfg.h/cc
D2ClientMgr class is now in d2_client_mgr.h/cc

 - 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

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.

Now awaiting the merging of #2980 (the hooks code) so that the
configuration validation code can check if the libraries are valid
before accepting the configuration.

a simple-type parser. Replaces individual class definitions
for BooleanParser, Uint32Parser, and StringParser.  Base class
uses new ValueStore<> storage template class.

dhcp_parsers_unittest.cc.  Added Element type checks to
Boolean and String parsers, corrected some commentary.

of the common parser refactoring. Replaced individual global variables with
instance of new ParserContext class. Created new base classes PoolParser
and SubnetConfigParser.

configuration parsing classes into a common set of classes
in lib/dhcpsrv.  Moved most of the parsers classes into
new files dhcp_parsers.h/cc. Eliminated use of global
variables within common parsers.