Override user & group choices on ceph-disk to be ceph:disk.
Override user & group choices on ceph-disk to be ceph:disk.

Signed-off-by: Mike Shuey <ad61365375f1c0fead87382933701f5f56652f9c@purdue.edu>

dmitryint/ceph-docker,AcalephStorage/ceph-docker,osixia/ceph-docker,rootfs/ceph-docker,cdxvirt/ceph-docker,fmeppo/ceph-docker,AcalephStorage/ceph-docker,ceph/ceph-docker,fmeppo/ceph-docker,cdxvirt/ceph-docker,rootfs/ceph-docker,JrCs/ceph-docker,osixia/ceph-docker,dmitryint/ceph-docker,dmitryint/ceph-docker,AcalephStorage/ceph-docker,mkkie/ceph-docker,JrCs/ceph-docker,osixia/ceph-docker,mkkie/ceph-docker,fmeppo/ceph-docker,ceph/ceph-docker,JrCs/ceph-docker