[Falcon][ONOS-3601] Add REST API for metrics service with unit test

Change-Id: I33ec561d1d83c6f1167e960bc2f684a117e6ea9c
diff --git a/web/api/pom.xml b/web/api/pom.xml
index 99aeab2..6d483d9 100644
--- a/web/api/pom.xml
+++ b/web/api/pom.xml
@@ -102,7 +102,9 @@
                             org.onlab.osgi.*,
                             org.onlab.packet.*,
                             org.onlab.rest.*,
-                            org.onosproject.*
+                            org.onosproject.*,
+                            org.onlab.metrics.*,
+                            com.codahale.metrics.*
                         </Import-Package>
                         <Web-ContextPath>${web.context}</Web-ContextPath>
                     </instructions>