Fix hc ref

[chenBright]

What problem does this PR solve?

Issue Number:

Problem Summary:

#1814 在PrintConnections、~SocketMap这两个位置漏了判断health_check_interval()

What is changed and the side effects?

Changed:

Side effects:

• Performance effects(性能影响):

• Breaking backward compatibility(向后兼容性):

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Check List:

• Please make sure your changes are compilable(请确保你的更改可以通过编译).
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