debian: sync logrotate packaging with downstream

debian: sync logrotate packaging with downstream

both Ubuntu and Debian put the logrotate script into
ceph-common, to ensure that radosgw logs are rotated as
well.

to prevent duplicate logrotate scripts handling the same log
files, and to minimize the delta between upstream and
downstream packaging, sync this change back upstream.

Fixes: http://tracker.ceph.com/issues/19938
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>