Add OFPortDesc helper methods
remove toBriefString
Add isEnabled to interface and add tests
improve test case
Merge into master from pull request #359:
Add OFPortDesc helper methods (https://github.com/floodlight/loxigen/pull/359)
add ipv4_netmask tlv
Merge into master from pull request #361:
add ipv4_netmask tlv (https://github.com/floodlight/loxigen/pull/361)
Merge remote-tracking branch 'origin/master' into reference-tlv

Conflicts:
	openflow_input/bsn_tlv