[ONOS-8093] Purge Meter API

Change-Id: I8e5a6826793b9f17d7115e241a12e3a2972b38a9
diff --git a/apps/virtual/app/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkMeterManager.java b/apps/virtual/app/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkMeterManager.java
index 2cce14c..9ec530b 100644
--- a/apps/virtual/app/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkMeterManager.java
+++ b/apps/virtual/app/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkMeterManager.java
@@ -216,6 +216,11 @@
         // Do nothing
     }
 
+    @Override
+    public void purgeMeters(DeviceId deviceId) {
+        // Do nothing
+    }
+
     private class InternalMeterProviderService
             extends AbstractVirtualProviderService<VirtualMeterProvider>
             implements VirtualMeterProviderService {