RFR: 8319651: Several network tests ignore vm flags when start java process

[Darragh Clarke]

Currently these tests ignore vm flags, In most cases I've updated them to use `ProcessTools.createTestJavaProcessBuilder` this usually required some cleanup also.

`test/jdk/java/net/ServerSocket/AcceptCauseFileDescriptorLeak.java` and `test/jdk/java/net/URLConnection/6212146/TestDriver.java` have been set to use `@require vm.flagless` because they both use `sh` commands.

I've ran these changes against tiers 1-3 and everything seems stable

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Commit messages:
 - merge master into branch
 - fixed library use and copyright
 - merge master into branch
 - update tests to use process tools or ignore flags

Changes: https://git.openjdk.org/jdk/pull/17787/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17787&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319651
  Stats: 122 lines in 14 files changed: 27 ins; 35 del; 60 mod
  Patch: https://git.openjdk.org/jdk/pull/17787.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17787/head:pull/17787

PR: https://git.openjdk.org/jdk/pull/17787