Fix checkstyle whitespace issues - WHITESPACE ONLY

Change-Id: Ic205c1afd639c6008d61d9de95cb764eeb6238ca
diff --git a/src/main/java/net/onrc/onos/core/util/Pair.java b/src/main/java/net/onrc/onos/core/util/Pair.java
index 36a76bb..abf9fed 100644
--- a/src/main/java/net/onrc/onos/core/util/Pair.java
+++ b/src/main/java/net/onrc/onos/core/util/Pair.java
@@ -4,22 +4,22 @@
  * A generic class representing a pair of two values.
  */
 public class Pair<F, S> {
-    public F first;		// The first value in the pair
-    public S second;		// The second value in the pair
+    public F first;        // The first value in the pair
+    public S second;        // The second value in the pair
 
     /**
      * Constructor for a pair of two values.
      *
-     * @param first the first value in the pair.
+     * @param first  the first value in the pair.
      * @param second the second value in the pair.
      */
     public Pair(F first, S second) {
-	this.first = first;
-	this.second = second;
+        this.first = first;
+        this.second = second;
     }
 
     @Override
     public String toString() {
-	return String.format("<%s, %s>", first, second);
+        return String.format("<%s, %s>", first, second);
     }
 }