[bug report] Client shutdown (without explicit flush) does not flush buffered atomic increments

HBaseIncExample.java

import org.hbase.async.AtomicIncrementRequest;
import org.hbase.async.HBaseClient;

public class HBaseIncExample {

  public static void main(String [] args) throws Exception {
    HBaseClient client = new HBaseClient("rasalghul");
    AtomicIncrementRequest req = new AtomicIncrementRequest("t0", "k1", "f1", "q1");

    for (int i = 0; i < 100; i++) {
      client.bufferAtomicIncrement(req);
    }
    client.shutdown().join();
  }

}