[jdk11u-dev] RFR: 8182404: remove jdk.testlibrary.JDKToolFinder and JDKToolLauncher

[Goetz Lindenmaier]

I want to backport this ot simplify follow-up test backports.

I had to resolve JstatdTest.java. Trivial.

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Depends on: https://git.openjdk.java.net/jdk11u-dev/pull/945

Commit messages:
 - Backport 8182404

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/951/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=951&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8182404
  Stats: 328 lines in 45 files changed: 13 ins; 270 del; 45 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/951.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/951/head:pull/951

PR: https://git.openjdk.java.net/jdk11u-dev/pull/951