Bug Fix in DistributedMeterStore

When a meter fails to get added via ONOS app, instead of showing the reason for failure, it throws exception:
IllegalArgumentException: Class is not registered: org.onosproject.net.meter.MeterFailReason

This fix registers approprate class to eliminate the exception.

Change-Id: I34cf10e7644980c9b40c3d6d4a51f5a6969f2d95
diff --git a/core/store/dist/src/main/java/org/onosproject/store/meter/impl/DistributedMeterStore.java b/core/store/dist/src/main/java/org/onosproject/store/meter/impl/DistributedMeterStore.java
index 792c18b..99bbac1 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/meter/impl/DistributedMeterStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/meter/impl/DistributedMeterStore.java
@@ -98,7 +98,8 @@
             .register(DefaultBand.class)
             .register(Band.Type.class)
             .register(MeterState.class)
-            .register(Meter.Unit.class);
+            .register(Meter.Unit.class)
+            .register(MeterFailReason.class);
 
     private Serializer serializer = Serializer.using(Lists.newArrayList(APP_KRYO_BUILDER.build()));