Fix socket path pattern match

The old regular expression for socket path can't catch the example "ceph-mon.www.abc.com.asok", the service type will be "mon.www.abc.com" if we use the old regular expression, it is incorrect.
The new regular expression  "^(.+)-(\w+)\\.(.+)\\.asok$" can catch the example and "\w+" will match all service type in ceph.