HA support for radosgw (WIP)

- mostly based on nova_dashboard

By updating, I mean regular running of chef with the recipe that created the resource.

My approach to resolve conflicts was:
 - each barclamp creates ```pacemaker_primitive "apache-#{barclamp_name}"``` instead of ```pacemaker_primitive "apache"```
 - in the recipe, there'd be a check if any ```apache-*``` primitive exists, and if yes, recipe only continues when current barclamp matches the name in the primitive (= "modify only mine, or create new if nothing exists")

It is likely this is the wrong approach, so I'm asking....