Add more service types to avoid salt-minon exception

If ceph-fuse is deployed, a socket named "ceph-client.admin.asok" would appear under
`/var/run/ceph`, and cause current code AttributeError. So this patch will
1) add "client" to the regular expression matching pattern
2) ignore AttributeError from method service_status(), to avoid potential errors in future
I think you might propose to those ceph guys to normalize the service names. If there're dashes in names and we rely on dashes to split the socket name string, we have no way to determine which part is `cluster_name`, `service_type` or `service_id`. For now, I think the best way to handle them is case by case.