Follow-up to c9f1bff, only allow daemons to reach 'READY' state

By definition, the readiness notification is reserved for daemons.  May
possibly be extended also to sysv services later.  If you arrive hare
with that request, please file an issue with the project.

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

src/service.c

@@ -2038,11 +2038,14 @@ void service_forked(svc_t *svc)
 	svc_set_state(svc, SVC_RUNNING_STATE);
 }
 
-/* Set service/foo/ready condition and call optional ready:script */
+/* Set service/foo/ready condition for services and call optional ready:script */
 void service_ready(svc_t *svc)
 {
 	char buf[MAX_COND_LEN];
 
+	if (!svc_is_daemon(svc))
+		return;
+
 	snprintf(buf, sizeof(buf), "service/%s/ready", svc_ident(svc, NULL, 0));
 	cond_set(buf);