Acceptance volume cmp 967

Fixes https://clusterhq.atlassian.net/browse/FLOC-967
@adamtheturtle could you explain this comment further, as I'm not entirely sure what you mean? This approach is checking the expected vs actual deployment state on each node individually, so you'll know if either node is not what you tried to push (and which node was wrong). But maybe I'm misunderstanding what you're saying?