[3274] RelayInfo parser implemented.
[3274] Relay info support added to DHCPv4 parsers.
[3274] Support for relay information in parser for DHCPv6 added
[3274] Added dhcp/classify.h
[3274] Added Classes parameter to getSubnet{4,6} methods.
[3274] ClientClass added, Classes renamed to ClientClasses
[3274] Subnets are now able to store client class information.
[3274] Client classification logic for IPv4 implemented.
[3274] Client classification for v6 implemented in CfgMgr
[3274] Client-class can now be specified in DHCPv{4,6} subnets config
[3274] DHCPv4 section of User's Guide written
[3274] DHCPv6 sections about client classification in User's Guide added
[3274] Proposed ChangeLog entry updated.
[3274] Missing changes in dhcp{4,6}.spec added.
[3274] Added new file for classify unittests.
[3274] Changes after review:

 - 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