Optimizations to improve flow setup rate
- Fetch UTCtimestamp only at the beigning of flow_handler proto process
  i.e., max upto 32 entries can have same setup time.
- get ksync nexthop from DB state instead of lookup
- Synchronous KSync-Vrouter operations, to remove limitation of 200
  outstanding message (for faster processing.)
Need to consider multiple response to one request.
Fix Source column bug in StatTable where query
Taking care of review comments.
    - added a knob in KSyncSock to run as Sync or Async
    - reverted changes for UTCtimestamp, will take it up later.
For link local service request, do src port nat. Bind to a local port, and use it as nat src port.
Update test case
Merge remote branch 'upstream/master'
Make BitSet::ToString() efficient - memory is allocated once.
Unit test cases for UVE Bandwidth usage of physical interface
Update for code review
Merge remote branch 'upstream/master'

Conflicts:
	src/vnsw/agent/pkt/flow_table.h
	src/vnsw/agent/pkt/test/test_pkt_flow.cc
Merge branch 'master' into ashoksr_ut
Merge remote branch 'upstream/master'
Remove unused field AgentRouteData::Op
Remove unused code in RouteDelete and AgentRouteTable::Input
Increasing the Cfg stale timeout from 2 minutes to 15 minutes
* Increase vrf delete timeout to 15 minutes
Add tests for nova cfg connect/keepalive
fixing build break
push config_node_ip in config node uve
Merge branch 'master' into ashoksr_ut