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

This is a backport of 5c6c366d2abe771c581690270c2d176ebb30c571 with the
version numbers changed, to compensate for the change in
fe3434f41cd09433975d7d0f9dbb2fae662e4a1b (backported in
bf1933e5c184476a354664c42fec834e9f59067c).

Tested-by: Tamil Muthamizhan <tamil.muthamizhan@inktank.com>
Signed-off-by: Sage Weil <sage@redhat.com>