[VOL-4055][ONOS-8138] Adding annotations to meter to allow passing of associated information

This patch allows for adding key value elements in the meter request and in the meter generated from it.
An example is:
Annotations annotations = DefaultAnnotations.builder().set("MeterForDeviceType", "olt").build();
DefaultMeterRequest.builder().withAnnotations(annotations)
Generates:
 DefaultMeter{device=of:00000a0a0a0a0a0b, cellId=2, appId=org.opencord.olt, unit=KB_PER_SEC, isBurst=true, state=ADDED, bands=[DefaultBand{rate=100000, burst-size=5000, type=DROP, drop-precedence=null}, DefaultBand{rate=100000, burst-size=5000, type=DROP, drop-precedence=null}, DefaultBand{rate=100000, burst-size=0, type=DROP, drop-precedence=null}], annotations={MeterForDeviceType=olt}}

Change-Id: Ifaded96ebeb7956bc60cdf311180c984c3ba954e
diff --git a/web/api/src/test/java/org/onosproject/rest/resources/MetersResourceTest.java b/web/api/src/test/java/org/onosproject/rest/resources/MetersResourceTest.java
index 65b932d..d7db030 100644
--- a/web/api/src/test/java/org/onosproject/rest/resources/MetersResourceTest.java
+++ b/web/api/src/test/java/org/onosproject/rest/resources/MetersResourceTest.java
@@ -34,6 +34,7 @@
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
 import org.onosproject.core.DefaultApplicationId;
+import org.onosproject.net.AbstractAnnotated;
 import org.onosproject.net.DefaultDevice;
 import org.onosproject.net.Device;
 import org.onosproject.net.DeviceId;
@@ -104,7 +105,7 @@
     /**
      * Mock class for a meter.
      */
-    private static class MockMeter implements Meter {
+    private static class MockMeter extends AbstractAnnotated implements Meter {
 
         final DeviceId deviceId;
         final ApplicationId appId;