RFR: 8336815: Socket.bind/connect and ServerSocket.bind/accept do not specify behavior when already bound, connected or closed

[Jaikiran Pai]

Can I please get a review of this change which updates the specification of a few methods in `java.net.Socket` and `java.net.ServerSocket` classes to specify the `IOException` that the implementation currently already throws?

This is merely a doc update and doesn't change the implementation.

Given that these exceptions can now be asserted, a new jtreg test has been introduced to verify the exceptions thrown from these APIs. The test passes. tier testing is currently in progress. I'll open a CSR shortly.

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Commit messages:
 - 8336815: Socket.bind/connect and ServerSocket.bind/accept do not specify behavior when already bound, connected or closed

Changes: https://git.openjdk.org/jdk/pull/20268/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20268&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336815
  Stats: 147 lines in 3 files changed: 141 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/20268.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20268/head:pull/20268

PR: https://git.openjdk.org/jdk/pull/20268