Remove ksync dependency from other modules like oper
Make init decide on the modules to be used
Cleanup top level SConscript for agent
Change alias to use "agent:" as prefix instead of full path
Group the dependencies for buildinfo to external, common and agent libraries
DHCP Snoop audit must delete only entries not seen from config
Fix bug in kernel scan code in handling DEL_ADDR

Change-Id: I3340561d5847efbefcbbfa151464535c8c8aa5d8