Fix value error in controller block/unblock
Unblock all peers on startup
Fix BSC refactor bug
When restarting switches, avoid both DEAD and STARTING controllers
Don't forget about other previously seen violations just because all controllers are dead
Very minor changes
Big refactor of VMController
Block/unblock peers both ways
Fix global name SSHException not defined error
Fix global name paramiko.SSHException not defined error
Fix Block/UnblockControllerPair bugs
Fix self.ssh_client can't set attribute bug
Fix Controller has no attribute execute_remote_cmd bug
Add option to buffer persistent violations instead of returning them right away
Add safeguard against failed SSH connection
Minor edit
Merge branch 'master' of github.com:ucb-sts/sts
Use new-style classes
Temporary fix: MockControllerManager needs a live_controllers method

long term fix will be to give interactive_replayer a different set of options
than normal interactive.
Second temp fix to MockControllerManager/InteractiveReplayer