Added support for running ceph on compute nodes.

Added an option to enable ceph to run on nodes that are
running compute services. This is due to the need to configure
virsh with the ceph secret on compute nodes. I also added
examples on how a user can configure their journal
settings in ceph01.xml.

Change-Id: I4dd475a73664a9a2d1baf38851f5e85e4e2b41d7
Closes-Bug: #1274649