Enforce OVSDB runs as an OVSDB client mode only during SONA startup

Change-Id: I9aefab86ba8e13e349f75ec0beccfc5b0048f809
diff --git a/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/impl/DefaultOpenstackNodeHandler.java b/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/impl/DefaultOpenstackNodeHandler.java
index b9e193a..e8de7a0 100644
--- a/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/impl/DefaultOpenstackNodeHandler.java
+++ b/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/impl/DefaultOpenstackNodeHandler.java
@@ -151,6 +151,7 @@
         deviceService.addListener(ovsdbListener);
         deviceService.addListener(bridgeListener);
         osNodeService.addListener(osNodeListener);
+        ovsdbController.setServerMode(false);
 
         log.info("Started");
     }