Corrected OOO with sensu needing rabbit

We have meta configs in some roles to run common, rabbit, and
sensu-client. However, common and sensu-client are already
applied to every node.  Rabbit and common should not be
necessary in the roles/x/meta/main.yml dependencies.
Merge pull request #73 from blueboxgroup/blueboxgroup/sensu-requires-rabbit

Corrected OOO with sensu needing rabbit