Fix #280: allow calling initctl restart foo from within foo

Move the stop+start from initctl to the state machine by allowing
stopped tasks to restart once it has been collected.  This should
prevent finit from blocking, allowing it to handle other requests
while waiting for the service's PID to be collected.

Effectively, this will allow a service to call initctl to restart
itself, as reported in issue #280.

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

src/service.c

@@ -731,10 +731,14 @@ static void service_cleanup(svc_t *svc)
  * service_stop - Stop service
  * @svc: Service to stop
  *
+ * Called externally by initctl to perform stop/start (restart) of
+ * services.  Internally it is used to bring a run/task/service to
+ * HALTED state.
+ *
  * Returns:
  * 0 if the service was successfully stopped. Non-zero otherwise.
  */
-static int service_stop(svc_t *svc)
+int service_stop(svc_t *svc)
 {
 	char cmdline[CMD_SIZE] = "";
 	int do_progress = 1;