Move HOOK_SHUTDOWN so it runs right before runlevel change

The shutdown hook is supposed to run right before services start
receiving SIGTERM.  Change due to previous refactor.

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

service.c

@@ -486,6 +486,11 @@ void service_reload_dynamic(void)
  */
 void service_runlevel(int newlevel)
 {
+	if (newlevel == 0 || newlevel == 6) {
+		/* Call all shutdown hooks before rebooting... */
+		plugin_run_hooks(HOOK_SHUTDOWN);
+	}
+
 	sm_set_runlevel(&sm, newlevel);
 	sm_step(&sm);
 }

sig.c

@@ -114,9 +114,6 @@ void do_shutdown(shutop_t op)
 		}
 	}
 
-	/* Call all shutdown hooks before rebooting... */
-	plugin_run_hooks(HOOK_SHUTDOWN);
-
 	/* Update UTMP db */
 	utmp_set_halt();