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

[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.

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Commit messages:
 - reformat the code
 - remove unreachable code and reformatting the code
 - 8313657 : com.sun.jndi.ldap.Connection.cleanup does not close connections on SocketTimeoutErrors

Changes: https://git.openjdk.org/jdk/pull/15143/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15143&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313657
  Stats: 197 lines in 2 files changed: 196 ins; 0 del; 1 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