RFR: 8313657 : com.sun.jndi.ldap.Connection.cleanup does not close connections on SocketTimeoutErrors [v4]

[Weibing Xiao]

On Wed, 9 Aug 2023 00:21:55 GMT, Weibing Xiao <duke at openjdk.org> wrote:

>> com.sun.jndi.ldap.Connection::leanup does not close the underlying socket if the is an IOException generation when the output stream was flushing the buffer.
>> 
>> Please refer to the bug https://bugs.openjdk.org/browse/JDK-8313657.
>
> Weibing Xiao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update method name and test case

1) Cannot make CustomSocket be private. The test failed. I believe JDK is using the reflection to load the class.
2) The rest of the changes are based on the comments.

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PR Comment: https://git.openjdk.org/jdk/pull/15143#issuecomment-1671228915