Change ACTIVE, BUILD, and ERROR to NamedConstants, and do some test cleanup because load balancers with cheese is a list
Move draining timeout from a per-node load balancer config attribute to an attribute in desired state
Add a SetMetadataItem step
Rename a variable to something maybe more clear
Remove draining timeout comparison test
Merge pull request #729 from rackerlabs/set-metadata-step-and-convergence-cleanup

Set metadata step and convergence cleanup