CC-580: Refactor iptables control into a separate library, and create a serviced chain
Merge branch 'develop' of github.com:control-center/serviced into feature/CC-580

* 'develop' of github.com:control-center/serviced:
  Fix a race in address assignment
  Fix smoke tests to work with new assigned IPs; add stop service test to prevent leaking iptables rules

Conflicts:
	node/agent.go
CC-580: Log if there's an error creating the chain
Merge pull request #1383 from control-center/feature/CC-580

CC-580: Refactor iptables control into a separate library, and create a serviced chain