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
It is not desirable to swallow all AttributeError at such a broad scope, if you're catching it for the specific regex case then do that immediately around the regex line