On unstack : clean up network namespaces created by quantum

Also removes OVS ports

Fix Bug #1156837

Change-Id: Id4178c0a12a3ada76403a57a736a9c7a908d6a4a
diff --git a/unstack.sh b/unstack.sh
index 3ac2985..d1d0349 100755
--- a/unstack.sh
+++ b/unstack.sh
@@ -109,4 +109,5 @@
 if is_service_enabled quantum; then
     stop_quantum
     stop_quantum_third_party
+    cleanup_quantum
 fi