Fixed a side effect of Arcus interceptor

[emeroad]

Side effect : faild to failover.
Root cause : Unnecessary reverse DNS lookup
Bug fix : Avoid DNS lookup API.

• ApiInterceptor.java
• FutureGetInterceptor.java

@Override
public void after(Object target, Object[] args, Object result, Throwable throwable) {
...
            final Operation op = (Operation) getOperation.invoke(target);
            if (op != null) {
                MemcachedNode handlingNode = op.getHandlingNode();
                if (handlingNode != null) {
                    SocketAddress socketAddress = handlingNode.getSocketAddress();
                    if (socketAddress instanceof InetSocketAddress) {
                        InetSocketAddress address = (InetSocketAddress) socketAddress;
                       // ROOT Cause : Unnecessary DNS look ->  InetSocketAddress.getHostName() 
                        trace.recordEndPoint(address.getHostName() + ":" + address.getPort());
                    }
                } else {
                    logger.info("no handling node");
                }
            } else {
                logger.info("operation not found");
            }
}