NSX|V: retry on failed virtual wire create

In the event that a virtual wire creation fails then we will do
a retry. This may be due to the fact that the VC is busy.

Change-Id: Ib5af704deac86dfe3414bdb949c534ef8e8ed071

vmware_nsx/plugins/nsx_v/vshield/vcns.py

@@ -429,6 +429,7 @@ class Vcns(object):
         uri = self._build_uri_path(edge_id, IPSEC_VPN_SERVICE)
         return self.do_request(HTTP_GET, uri)
 
+    @retry_upon_exception(exceptions.RequestBad)
     def create_virtual_wire(self, vdn_scope_id, request):
         """Creates a VXLAN virtual wire