rearrange Ceph storage options in OpenStack settings and setup wizard

On CentOS and Ubuntu, present a list of checkboxes to enable LVM and/or
Ceph for volumes, Ceph for images, and Swift and/or Ceph for objects,
with all checkboxes off by default. On RHOS, Ceph options are disabled
in the wizard and absent from the settings tab.
Remove mount point from cephjournal volume definition