Duplicated warn log in class DefaultMQProducerImpl is unnecessary.

[XiaoyiPeng]

BUG REPORT

1. Please describe the issue you observed:

rocketmq/client/src/main/java/org/apache/rocketmq/client/impl/producer/DefaultMQProducerImpl.java

Lines 628 to 636 in 895bd95

	} catch (InterruptedException e) {
	endTimestamp = System.currentTimeMillis();
	this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, false);
	log.warn(String.format("sendKernelImpl exception, throw exception, InvokeID: %s, RT: %sms, Broker: %s", invokeID, endTimestamp - beginTimestampPrev, mq), e);
	log.warn(msg.toString());
	log.warn("sendKernelImpl exception", e);
	log.warn(msg.toString());
	throw e;

As show above, line#634, line#635 is is repeated with line#631, line#632.

2. Please tell us about your environment:

   OS: Mac OS catalina
   branch: develop