Clean code and refine javadocs for control plane manager

Change-Id: Ieaaebde69ce2ab54cb819cfad1baa34ee97a7d66
diff --git a/apps/cpman/app/src/main/java/org/onosproject/cpman/impl/ControlMetricsObserver.java b/apps/cpman/app/src/main/java/org/onosproject/cpman/impl/ControlMetricsObserver.java
index fb0bf8b..771c5cd 100644
--- a/apps/cpman/app/src/main/java/org/onosproject/cpman/impl/ControlMetricsObserver.java
+++ b/apps/cpman/app/src/main/java/org/onosproject/cpman/impl/ControlMetricsObserver.java
@@ -28,7 +28,7 @@
      * Feeds the extracted value from MetricAggregator to back-end storage.
      *
      * @param metricsAggregator metric aggregator
-     * @param deviceId          device id {@link org.onosproject.net.DeviceId}
+     * @param deviceId          device identification
      */
     void feedMetrics(MetricsAggregator metricsAggregator, Optional<DeviceId> deviceId);