Improve duplicate update detection.

Handle the case where the combination of the AdvertiseSList and the
UpdateInfoSList in the RouteUpdate contain the same information as
the UpdateInfoSList from the export policy results.  We previously
used to do a simple comparison of the UpdateInfoSLists.
Convert static functions to methods for RouteState and RouteUpdate.
Code reorg for agent/pkt code
Merge remote branch 'upstream/master'
Merge remote branch 'upstream/master'

Conflicts:
	src/vnsw/agent/pkt/pkt_flow_info.cc
	src/vnsw/agent/pkt/pkt_init.cc
	src/vnsw/agent/pkt/tap_interface.cc
Further improvements in the duplicate detection code.

Handle the special case where the given UpdateInfoSList is empty.
Implement new logic that's easier to follow for the other cases.
Use new category for BGP Config logs.
Patch in:
commit e9572f3e8e78ca5ce44b7e0ec84568dea97adb8c
Author: Megh Bhatt <meghb@juniper.net>
Date:   Mon Dec 30 16:51:38 2013 -0800

    1. Change TCP session reader task for vizd from the sandesh state
       machine task to the IO reader task so that the sandesh message
       reading and processing can happen in parallel. This reverts the
       change done as part of bug 1729 to make the session reader task
       and state machine task exclusive. The issue mentioned in bug
       1729 is handled by setting the session sandesh message receive
       callback to NULL as part of session delete/close which happens
       from the state machine task.
    2. Increase the VizSession receive buffer size to 16K from 4K
       since the Sandesh client average send is around 10K bytes.

    With the above 2 changes, on a single box setup, vizd is able to
    receive 50K flow samples at steady state with no drops on the sandesh
    client.
Fix issue with DHCP relay when IP is zero, fix merge issues
Replace Agent::GetInstance() with agent object passed down
address comments
Fix buildinfo generation dependencies
Merge pull request #116 from haripk/master

Code reorg for agent/pkt code

Merging the intermediate changes. Expecting that subsequent commits will take care of scoped memory allocation and other comments.
Merge pull request #127 from Juniper/bugs

Fix buildinfo generation dependencies after code re-reorg
Merge pull request #114 from Juniper/nsheth_duplicate_update

Improve duplicate update detection.
Merge pull request #121 from Juniper/nsheth_bgp_config_category

Use new category for BGP Config logs.
More tests and additional verification for RouteUpdate dequeue/enqueue.
Merge pull request #128 from Juniper/nsheth_bgp_update_tests

More tests and additional verification for RouteUpdate dequeue/enqueue.
Merge pull request #122 from Juniper/meghb_missedcommits

Patch in: e9572f3e8e78ca5ce44b7e0ec84568dea97adb8c
Cosmetic changes to config code.