Use abs instead of Math.abs to avoid issue when hash returns Integer.…

…MIN_VALUE.

src/java/voldemort/routing/ConsistentRoutingStrategy.java

@@ -80,7 +80,6 @@ public ConsistentRoutingStrategy(HashFunction hash, Collection<Node> nodes, int
      * Math.abs returns Integer.MIN_VALUE if a == Integer.MIN_VALUE and this
      * method returns Integer.MAX_VALUE in that case.
      */
-    @SuppressWarnings("unused")
     private static int abs(int a) {
         if(a >= 0)
             return a;
@@ -149,7 +148,7 @@ Set<Integer> getPartitionsByNode(Node n) {
     }
 
     public List<Integer> getPartitionList(byte[] key) {
-        int index = Math.abs(hash.hash(key)) % (Math.max(1, this.partitionToNode.length));
+        int index = abs(hash.hash(key)) % (Math.max(1, this.partitionToNode.length));
         return getReplicatingPartitionList(index);
     }
 }