fix: TxnManager with state AutoCommit should not be saved in http manager.

[youngsofun]

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Summary

which leads to unexpected log like transaction timeout after 14400 timeout

• let me test it against our clients.
  • go
  • jdbc

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

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This change is 

[SkyFan2002]

LGTM. But it I'm worried that if the timeout statement is executed in a multi statement transaction, It will still time out. I'm not sure if it's enough for the transaction status to be retained for four hours. @youngsofun @dantengsky

[youngsofun]

@SkyFan2002
the older timer is canceled on next statement, a new timer is start when it finish