rgw: create a separate logrotate file for radosgw

Fixes: #3813
Since radosgw package is separate from the ceph package,
it also needs to have a separate logrotate. The default
path for radosgw log is changed to /var/log/radosgw,
and it now has a different logrotate script.
Updating both deb and rpm packaging.

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
logrotate.conf:  Remove unneeded loop and update new rgw version.

Remove an unneeded for loop from the ceph logrotate.conf, and
update the new rgw logrotate.conf to reload the radosgw serivce.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>