[RIP-40] Add test case for LockBatchResponseBody

[icersummer]

What is the purpose of the change

Add test case (LockBatchResponseBodyTest.java) for org.apache.rocketmq.common.protocol.body.LockBatchResponseBody.java

Brief changelog

Add test case (LockBatchResponseBodyTest.java) for org.apache.rocketmq.common.protocol.body.LockBatchResponseBody.java

Verifying this change

XXXX

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[coveralls]

Coverage decreased (-0.07%) to 47.997% when pulling c1c9904 on icersummer:develop into 42ddf3d on apache:develop.

[RongtongJin]

Besides test, there are other commit records. Could you please handle them?

[RongtongJin]

I'll close this PR first. Please feel free to reopen it if you have any other questions.