debian/control: fix python-ceph -> ceph file move to allow upgrades

See fe3434f41cd09433975d7d0f9dbb2fae662e4a1b.

Signed-off-by: Sage Weil <sage@redhat.com>
ceph.spec: make ceph -> python-ceph dependency specify version

It does this indirectly via ceph -> ceph-common -> python-ceph, but do so
here too for clarity/consistency.

Signed-off-by: Sage Weil <sage@redhat.com>
Merge branch 'wip-9658' into giant