RFR: 8353642: Deprecate networking permission classes for removal

[Daniel Fuchs]

Please find her a patch that deprecate networking permission classes for removal. The method `URL::getPermission` now serves little  purpose and is also deprecated. That method was overridden in subclasses and specified to return some of the deprecated permissions.

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Commit messages:
 - 8353642: Deprecate networking permission classes for removal

Changes: https://git.openjdk.org/jdk/pull/24592/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24592&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353642
  Stats: 58 lines in 12 files changed: 36 ins; 4 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/24592.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24592/head:pull/24592

PR: https://git.openjdk.org/jdk/pull/24592