Add alarm endpoint.
Add in functionality to do health checks.
Have the alarm endpoint conduct the health check.

I added a TODO to actually do something with this.
Use a real example payload in the tests
Manually iterate over the list of serverpolicies and filter based on state. Ugh.
Removed the line about not knowing what the webhook looks like
Have check_quorum_health take a policy_id, rather than an alarm_id
Merge pull request #7 from rackerlabs/auto-368-maas-webhook

Auto 368 maas webhook
Merge branch 'master' into auto-185-worker-api