Add event to signal when all switches have reconnected after failover

Also add more resilience to consolidateStore.

* Fix switch state-machine bug. Need to set the state before calling
  sendRoleReqest because sendRoleRequest could directly set the role
  to Master if the switch is known to not support Nicira role requests
* In REST handling: replace empty roleChangeDescription with none so we
  don't violate IFloodlightProvider.setRole's contract of requiring a
  non-null description
* Use correct package name for FloodightProvider in
  bigfloodlight.properties

Havana demo (https://github.com/bigswitch/bigswitchcontroller/pull/3208)

Add AppCookie.registerApp() and block flow mod cookies (https://github.com/bigswitch/bigswitchcontroller/pull/3237)

Ordering of modules for HA role change. (https://github.com/bigswitch/bigswitchcontroller/pull/3235)

Check to make sure all switches on the path are active before establishing a flow-mod.  Add a unit test to verify this is the behavior.

Also get rid of IOFSwitchFilter which is unused

Conflicts:
	bigfloodlight/src/main/java/com/bigswitch/floodlight/bvs/web/ExplainResource.java
	bigfloodlight/src/main/java/com/bigswitch/floodlight/forwarding/Forwarding.java
	bigfloodlight/src/main/resources/META-INF/services/net.floodlightcontroller.core.module.IFloodlightModule
	bigfloodlight/src/main/resources/bigfloodlight.properties
	bigfloodlight/src/test/java/com/bigswitch/floodlight/bvs/virtualrouting/serviceinsertion/internal/ServiceInsertionServiceEndToEndTest.java

* consolidate store after SLAVE->MASTER transition
* more unit tests for Controller and OFChannelHandler
* fix some issues found while unit testing

Remove portBroadcastDomainLink map from link discovery as it does not affect correctness.  Remove unused variable and uncalled method.