[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/apps/pom.xml b/apps/pom.xml
index 7abc49a..1505f76 100644
--- a/apps/pom.xml
+++ b/apps/pom.xml
@@ -38,6 +38,7 @@
         <module>sdnip</module>
         <module>optical</module>
         <module>metrics</module>
+        <module>metricsreporter</module>
         <module>routing</module>
         <module>routing-api</module>
         <module>reactive-routing</module>