Apply the naming convention to BatchOperationEntry

Resolve ONOS-889

Change-Id: I2001fabba138b9ff5be9a5943d3f020b4c38d195
diff --git a/core/api/src/main/java/org/onosproject/net/flow/BatchOperationEntry.java b/core/api/src/main/java/org/onosproject/net/flow/BatchOperationEntry.java
index fc24775..7e0d5b5 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/BatchOperationEntry.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/BatchOperationEntry.java
@@ -48,7 +48,17 @@
      *
      * @return the target object of this operation
      */
+    @Deprecated
     public U getTarget() {
+        return target();
+    }
+
+    /**
+     * Gets the target object of this operation.
+     *
+     * @return the target object of this operation
+     */
+    public U target() {
         return target;
     }
 
@@ -57,7 +67,17 @@
      *
      * @return the operator of this operation
      */
+    @Deprecated
     public T getOperator() {
+        return operator();
+    }
+
+    /**
+     * Gets the operator of this operation.
+     *
+     * @return the operator of this operation
+     */
+    public T operator() {
         return operator;
     }