WIP haproxy instead of nginx.
Added a few fixes to get haproxy working
Opened up ports to health checks pass
Remove the custom availability_zones.py patch

We are migrating to havana release.  No longer need to patch
this file.
Remove the custom availability_zones.py patch

We are migrating to havana release.  No longer need to patch
this file.
Removed a temporary rm task
Moved sensu monitoring into a playbook

Rather than having monitoring tasks inside many roles, move monitoring into
a single playbook where tasks are applied to the necessary roles.
Tune workers in dev env