RFR: JDK-8318006: remove unused net related coding

[Lutz Schmidt]

On Thu, 12 Oct 2023 13:14:31 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> [JDK-8253119](https://bugs.openjdk.org/browse/JDK-8253119) removed the old socket implementation code but it did leave some unused code behind, it would be good to remove these unused functions.

LGTM.

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Marked as reviewed by lucy (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16164#pullrequestreview-1675865732