Adding app_label to properly render API docs

Change-Id: I3a2df242f738e7e6f1cea26462cf2962926b960b
diff --git a/xos/vnaas.xproto b/xos/vnaas.xproto
index e8dce64..1a26fc5 100755
--- a/xos/vnaas.xproto
+++ b/xos/vnaas.xproto
@@ -1,4 +1,5 @@
 option name = "vnaas";
+option app_label = "vnaas";
 
 message EnterpriseLocation (XOSBase){
      option verbose_name = "Enterprise Location";