Wait 5 minutes before deciding to delete AvailableQueues.
Update unit tests for full coverage on grace period for missing workers.
Merge pull request #748 from pulp/jortel-agenthub

Remove agenthub support.
Automatic commit of package [pulp] release [2.3.1-0.8.beta].
Automatic commit of package [pulp-nodes] release [2.3.1-0.8.beta].
Merge (-s ours) pulp-2.3 => master, post-build
Don't explicitly index the _id field on the resources models.
Merge branch 'master' into distributed-tasks
Merge branch 'rbarlow-babysit_grace_period' into distributed-tasks