[SDFAB-352][SDFAB-353] Retrieve MeterFeatures from the P4RT southbound, Extend MeterProviderService and revisit MeterStore

Change-Id: I083df67ae5cf0513d82d0ccf00c790d2bb000ef4
diff --git a/core/net/src/test/java/org/onosproject/net/meter/impl/MeterManagerTest.java b/core/net/src/test/java/org/onosproject/net/meter/impl/MeterManagerTest.java
index 52970dd..09e9774 100644
--- a/core/net/src/test/java/org/onosproject/net/meter/impl/MeterManagerTest.java
+++ b/core/net/src/test/java/org/onosproject/net/meter/impl/MeterManagerTest.java
@@ -575,6 +575,12 @@
             mProgrammableAdded.setState(MeterState.ADDED);
             return CompletableFuture.completedFuture(ImmutableList.of(mProgrammableAdded));
         }
+
+        @Override
+        public CompletableFuture<Collection<MeterFeatures>> getMeterFeatures() {
+            //Currently unused.
+            return CompletableFuture.completedFuture(Collections.emptySet());
+        }
     }
 
     private class TestProvider extends AbstractProvider implements MeterProvider {