[ISSUE #367]Fix the get connection bug when sending transactional check request

[duhengforever]

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What is the purpose of the change

When sending a transaction check request, ProducerManager returned available connection is not the current connection, but the next connection.

Brief changelog

XX

Verifying this change

XXXX

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[coveralls]

Coverage increased (+0.004%) to 42.201% when pulling 5fc2032 on duhengforever:develop_fix into d8c446e on apache:develop.

[vongosling]

LGTM