two timed task for RequestFutureTable

[reidzhou]

BUG REPORT

• What did you do (The steps to reproduce)?
  create a producer

   DefaultMQProducer producer = new DefaultMQProducer("test");
   producer.setNamesrvAddr("");
   producer.start();
  

• What did you see instead?
  multi thread named 'ClientHouseKeepingService'
  

there is two timed task to update RequestFutureTable which is static resource.
is that a bug?

[panzhi33]

BUG REPORT

• What did you do (The steps to reproduce)?
  create a producer

   DefaultMQProducer producer = new DefaultMQProducer("test");
   producer.setNamesrvAddr("");
   producer.start();
  

• What did you see instead?
  multi thread named 'ClientHouseKeepingService'
  

there is two timed task to update RequestFutureTable which is static resource.
is that a bug?

yes，i can fix it

[RongtongJin]

Merged