Clayton O'Neill e226c0ed95 Allow RBD host to be configurable
Most sites using ceph with cinder are going to have already set the host
value.  This change allows those sites to override the default and not
break existing volumes.  It also moves the tests cases from the volume
class to the backend define.  Lastly, it renames the parameter from host
to backend_host, since host is deprecated with Kilo.

Change-Id: I43e4d3b7ae1672ea0c551c6c7267f0c38bb9842f
2015-10-05 15:59:23 +00:00
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