closes-bug:#1387064. Extracting right VN's uuid from Nova VIF plugin to send to Agent

Change-Id: If1e9514229ca9dbdf306b6b42cda2d7ff33a4a8a
Fix pagination issue in flow introspect page. FlowKey comparison function does comparison of family now (after merger of IPv6 branch). Initialize FlowKey's family while handling pagination for flow introspect page.
Closes-Bug: #1387524

Change-Id: I0951340492b20abb453db4c6f6aa699cea816fc2
Initialize the variables in the constructor - this was causing issues in allowed address pair state machine trigger

Change-Id: I394298c8cca7cdc2b967703c422603cc1e3b3298
Merge "closes-bug:#1387064. Extracting right VN's uuid from Nova VIF plugin to send to Agent"
Merge "Fix pagination issue in flow introspect page. FlowKey comparison function does comparison of family now (after merger of IPv6 branch). Initialize FlowKey's family while handling pagination for flow introspect page. Closes-Bug: #1387524"
Merge "Initialize the variables in the constructor - this was causing issues in allowed address pair state machine trigger"
Merge "Verify ASN in SecurityGroup extended community"
Cleanup a few APIs in mock agent

Following changes hasv been implemented:

- Pass NextHops parameter as a const reference instead of by value
- Remove NextHops and RouteAttribute parameters from delete methods

Change-Id: Iecd71053a82cf70404f1c5c726cb919096ad41e6