Clean code and refine javadocs for control plane manager

Change-Id: Ieaaebde69ce2ab54cb819cfad1baa34ee97a7d66
diff --git a/apps/cpman/api/src/main/java/org/onosproject/cpman/MetricValue.java b/apps/cpman/api/src/main/java/org/onosproject/cpman/MetricValue.java
index c853ef1..88abdf9 100644
--- a/apps/cpman/api/src/main/java/org/onosproject/cpman/MetricValue.java
+++ b/apps/cpman/api/src/main/java/org/onosproject/cpman/MetricValue.java
@@ -27,7 +27,7 @@
     private final long count;
 
     /**
-     * Constructor.
+     * Constructs a metric value using the given rate, load and count.
      *
      * @param rate rate
      * @param load load