Adding app_label to xproto

Change-Id: I0165c292cc1f40b9709004266ae9cc963508f094
diff --git a/xos/onos.xproto b/xos/onos.xproto
index defc4f1..5c79b44 100644
--- a/xos/onos.xproto
+++ b/xos/onos.xproto
@@ -1,4 +1,5 @@
 option kind="onos";
+option app_label = "onos";
 option name="onos";
 
 message ONOSApp (ServiceInstance){