Support openstack controller node status check feature

Change-Id: I285b977ae32dd6d140aca7f25b00962db77b1054
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java
index 538a5fd..e7492bf 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java
@@ -68,6 +68,7 @@
 import static org.onosproject.openstacknetworking.impl.HostBasedInstancePort.ANNOTATION_CREATE_TIME;
 import static org.onosproject.openstacknetworking.impl.HostBasedInstancePort.ANNOTATION_NETWORK_ID;
 import static org.onosproject.openstacknetworking.impl.HostBasedInstancePort.ANNOTATION_PORT_ID;
+import static org.onosproject.openstacknode.api.OpenstackNode.NodeType.CONTROLLER;
 
 @Service
 @Component(immediate = true)
@@ -297,6 +298,10 @@
 
         @Override
         public boolean isRelevant(OpenstackNodeEvent event) {
+
+            if (event.subject().type() == CONTROLLER) {
+                return false;
+            }
             // do not allow to proceed without mastership
             Device device = deviceService.getDevice(event.subject().intgBridge());
             if (device == null) {
@@ -325,7 +330,6 @@
                     // not reacts to the events other than complete and incomplete states
                     break;
                 default:
-                    log.warn("Unsupported openstack node event type");
                     break;
             }
         }