Add support for finit <stop|start|reload|restart> JOB

This patch further extends the capabilities of the client with the
ability to control the running state of services:

    finit <stop|start|reload|restart> JOB

Since services can now exist with multiple instances the concept of
"jobs" is introduced in this patch.  A job is a numeric identifier of
the form `NUM[:NUM]`, the latter `:NUM` is the new instance syntax
introduced earlier.  See the output of `finit status` for the JOB id.

Also, with the introduction of multiple instances we broke support for
multiple related inetd services.  This became obvious when the shiny new
`finit status` was tested ... hence, this patch also contains fixes to
the inetd support.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

service.h

@@ -34,6 +34,7 @@ svc_cmd_t service_enabled	 (svc_t *svc, int event, void *arg);
 
 int	  service_start	         (svc_t *svc);
 int	  service_stop	         (svc_t *svc);
+int       service_restart        (svc_t *svc);
 int	  service_reload	 (svc_t *svc);
 void      service_reload_dynamic (void);