RFR: 8366575: Remove SDP support

[Volkan Yazici]

Remove support for [SDP] (Sockets Direct Protocol), which has been obsolete for more than a decade – see [JDK-8366575] for details. Tier1-2 is clear.

[SDP]: https://docs.oracle.com/javase/tutorial/sdp/sockets/overview.html
[JDK-8366575]: https://bugs.openjdk.org/browse/JDK-8366575

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Commit messages:
 - Remove SDP support

Changes: https://git.openjdk.org/jdk/pull/28012/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28012&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366575
  Stats: 732 lines in 13 files changed: 0 ins; 732 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28012.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28012/head:pull/28012

PR: https://git.openjdk.org/jdk/pull/28012