minor name changes and javadoc

Change-Id: I43a05d75392efad9ac004867027a31adcc18c6f5
diff --git a/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java b/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java
index f620e08..051838a 100644
--- a/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java
+++ b/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java
@@ -51,6 +51,14 @@
     long addAndGet(long delta);
 
     /**
+     * Atomically sets the given value to the current value.
+     *
+     * @param value the value to set
+     */
+    void set(long value);
+
+
+    /**
      * Returns the current value of the counter without modifying it.
      *
      * @return current value