Code restructuring continuation
- Remove use of Agent::GetInstance() in interface files
- Use CfgListener::SkipNode instead of CfgListener::CanUseNode for simplicity
- Rename class PktInterface to PacketInterface
- Rename CfgFloatingIp to FloatingIpConfig, CfgServiceVlan to ServiceVlanConfig
  and CfgStaticRoute to StaticRouteConfig
Continuation of code cleanup for interfaces (More changes pending)
- Remove using of singleton variables in interface files
- Remove multiple constructors for interface
- Unify handling of ADD_DEL_CHANGE and RESYNC requests
Fix unit test failures caused by recent flow changes
* Retry addition of service vlan routes, on interface gets activated
* Added test case for same
* Add local composite NH as RPF NH for remote ecmp flows
* Remove code to trap reverse flow on component NH change, as it not needed
  after RPF checks
fixing gdb maro to take variable instead of calling function.
* Address review comments
reverese flow is deleted along with forward flow, if next entry is reverse flow
of the current one, skip!
- Converted assert to error in post_processing.cc
- Initialized integer variables to 0 before call to stringToInteger()
Change warning to trace for table-not-found errors since tables are created
via auto-generated code and the message is useful only for tests.
Fixing the unit-tests broken due to incorrect path to datafiles on github
Fix for bug 1987
contrail-analytics.rpm build should not run unit-test
* Add sg list along with ECMP routes
* Test case for same
* Consider prefix len along with IP for calculating dependency of flow on route
* Test case for same
Skip deleted routing instances
skip the deleted routing instance in sandesh show command.
Fix for bug1962. Protect subscription request from asynchronous access and messed up state by expiring subscriptions - use semaphore to lock access
Configure CURLOPT_CONNECTTIMEOUT for libcurl library which will close the TCP connection
and trigger the callback registered by the application.

Minumum connect timeout is tcp syn retries on the system, setting the connect
timeout to a low value ensures the callback is triggered after the system
timeout if connect fails.

Note if the CURLOPT_CONNECTTIMEOUT parameter is not configured it waits indefinelty.
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Bug 2076: Handle ValueError while building security group entries for compatibility with 1.0 release