[ONOS-8093] Purge Meter API

Change-Id: I8e5a6826793b9f17d7115e241a12e3a2972b38a9
(cherry picked from commit 4e4084cd6ded060616a5afa7d3af427715cfc2d0)
diff --git a/core/net/src/main/java/org/onosproject/net/meter/impl/MeterManager.java b/core/net/src/main/java/org/onosproject/net/meter/impl/MeterManager.java
index 03f4889..1979c61 100644
--- a/core/net/src/main/java/org/onosproject/net/meter/impl/MeterManager.java
+++ b/core/net/src/main/java/org/onosproject/net/meter/impl/MeterManager.java
@@ -298,6 +298,12 @@
         store.freeMeterId(deviceId, meterId);
     }
 
+    @Override
+    public void purgeMeters(DeviceId deviceId) {
+        // We delegate direclty to the store
+        store.purgeMeter(deviceId);
+    }
+
     private class InternalMeterProviderService
             extends AbstractProviderService<MeterProvider>
             implements MeterProviderService {