[ISSUE #546] Fix ConsumeMessageService#updateCorePoolSize" not support increase co…

[crzbird]

Fix: #546

What is the purpose of the change

makes method "ConsumeMessageService#updateCorePoolSize" support increase coreSize.

Brief changelog

use field RocketMQMessageListener#consumeThreadNumber as consumeExecutor coreSize, consumeThreadMax as consumeExecutor maximumSize.

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[crzbird]

@RongtongJin Hi,would you please check this issue? thanks.