dbus: notify externals when reconfiguration completes

initctl reload freezes conditions to the old generation and each
owner re-asserts.  Finit's own providers do this in-process; an
external provider whose conditions are generation files, rather than
the oneshot symlinks keventd uses, has no way to know the moment.
Emit Manager1.ConfigReloaded when reconfiguration completes.

keventd needs no subscriber: its conditions are symlinks to the
reconf marker itself, so they read the current generation by
construction and never flux, which the device bus test now pins
down.

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

src/sm.c

@@ -633,6 +633,9 @@ restart:
 		service_step_all(SVC_TYPE_ANY);
 
 		dbg("Reconfiguration done");
+#ifdef HAVE_DBUS
+		dbus_notify_reload();
+#endif
 		sm.state = SM_RUNNING_STATE;
 		break;
 	}