[jdk17u-dev] RFR: 8209935: Test to cover CodeSource.getCodeSigners() [v2]

[Goetz Lindenmaier]

> I backport this for parity with 17.0.7-oracle.

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into GoeLin-backport-0cb0ecf4
 - Backport 0cb0ecf4433f1054ba2f0fbdabee01323893e0fe

-------------

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/1125/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/1125/files/22ac95ba..5e496896

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1125&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1125&range=00-01

  Stats: 117 lines in 7 files changed: 80 ins; 12 del; 25 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1125.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1125/head:pull/1125

PR: https://git.openjdk.org/jdk17u-dev/pull/1125