RFR: 8313657 : com.sun.jndi.ldap.Connection.cleanup does not close connections on SocketTimeoutErrors [v2]

[Weibing Xiao]

> 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:

  updated the code according the review comments

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15143/files
  - new: https://git.openjdk.org/jdk/pull/15143/files/c7feb93f..abf8126c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15143&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15143&range=00-01

  Stats: 409 lines in 3 files changed: 205 ins; 198 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/15143.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15143/head:pull/15143

PR: https://git.openjdk.org/jdk/pull/15143