Add mq control_exchange to common messaging attributes.

Add common mq control exchange for components.

Change-Id: If89f95f638c3087775aec837e9c827ce42459b0a
Partial-Bug: #1259038
Reverts ceph.client.keyring.erb template

This template is used in the block-storage and image cookbooks

Change-Id: I038a985e4b3c77d552a7c885671754597154b05c
Closes-Bug: #1304421
Merge "Add mq control_exchange to common messaging attributes."
Merge "Reverts ceph.client.keyring.erb template"
Add [<service>-bind] attributes to each service namespace

Similar to what already existed for identity, this change adds a pair of *-bind
attributes for each service.  This allows for specifying a different
bind host or interface to actually bind a service to on each host, versus the
endpoint for the service which may be a separate IP on a load balancer.

This change is a pre-requisite change needed for the subsequent work in
each cookbook.

Change-Id: I3b0ee00a72bbe786b4ed399f79bb3c6f4c46167f
Merge "Add [<service>-bind] attributes to each service namespace"