selinux: Allow log files to be located in /var/log/radosgw

selinux: Allow log files to be located in /var/log/radosgw

We do suggest users to put their logs in /var/log/radosgw in the
documentation at times. We should also label that directory with
ceph_var_log_t so that ceph daemons can also write there.

The commit also updates the man page for this policy. This man page is
automatically generated by

* sepolicy manpage -p . -d ceph_t

and have not been reloaded in a while. Hence, it contains few more
changes than the new radosgw directory.

Signed-off-by: Boris Ranto <branto@redhat.com>