[jdk17u-dev] RFR: 8330523: Reduce runtime and improve efficiency of KeepAliveTest [v2]

[Christoph Langer]

> Backport this test improvement. I only had to do minor resolvation.

Christoph Langer 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 three additional commits since the last revision:

 - Adaptations for 17
 - Merge branch 'master' into backport-RealCLanger-c12dfc35
 - Backport c12dfc3571235bb57b2287e06c0cebb764f47a9a

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

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/2463/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/2463/files/45f4e6cc..9489fc4f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2463&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2463&range=00-01

  Stats: 852 lines in 20 files changed: 319 ins; 316 del; 217 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2463.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2463/head:pull/2463

PR: https://git.openjdk.org/jdk17u-dev/pull/2463