[ONOS-4127] Backup metric service to ganglia monitoring server

- Initial implementation of metric service reporter
- Unit test for metric service reporter
- Bump up metric lib from 3.1.0 to 3.1.2

Change-Id: Ia178df759d671dfc15cffaacb09d5279ad3d9ad8
diff --git a/features/features.xml b/features/features.xml
index 58750fb..01ea081 100644
--- a/features/features.xml
+++ b/features/features.xml
@@ -36,8 +36,8 @@
 
         <bundle>mvn:joda-time/joda-time/2.9</bundle>
 
-        <bundle>mvn:io.dropwizard.metrics/metrics-core/3.1.0</bundle>
-        <bundle>mvn:io.dropwizard.metrics/metrics-json/3.1.0</bundle>
+        <bundle>mvn:io.dropwizard.metrics/metrics-core/3.1.2</bundle>
+        <bundle>mvn:io.dropwizard.metrics/metrics-json/3.1.2</bundle>
         <bundle>mvn:com.eclipsesource.minimal-json/minimal-json/0.9.1</bundle>
 
         <bundle>mvn:com.esotericsoftware/kryo/3.0.0</bundle>