Added a framework for metrics

Added a metrics framework based on the codahale Metrics
package.  ONOS can create a registry and maintain Metrics,
as well as dump out metrics values via a REST API.  Unit
tests are include that test the REST APIs.  Currently
supports Timers, Counters, Gauges, Meters, and Histograms.

Change-Id: I0f6ed87f889dc7037caf9aefc92e663702c6dda8
diff --git a/src/main/resources/META-INF/services/net.floodlightcontroller.core.module.IFloodlightModule b/src/main/resources/META-INF/services/net.floodlightcontroller.core.module.IFloodlightModule
index 8460383..28c4a83 100644
--- a/src/main/resources/META-INF/services/net.floodlightcontroller.core.module.IFloodlightModule
+++ b/src/main/resources/META-INF/services/net.floodlightcontroller.core.module.IFloodlightModule
@@ -18,3 +18,4 @@
 net.onrc.onos.core.intent.runtime.PathCalcRuntimeModule
 net.onrc.onos.core.intent.runtime.PlanInstallModule
 net.onrc.onos.core.packetservice.PacketModule
+net.onrc.onos.core.metrics.OnosMetricsModule