[jdk11u-dev] RFR: 8219149: ProcessTools.ProcessBuilder should print timing info for subprocesses

[Goetz Lindenmaier]

I backport this test framework improvement as prereq of 8217170.

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Commit messages:
 - Backport 67defd71f28f9f4e6b6fd40fcb47a9a602e1f7a7

Changes: https://git.openjdk.org/jdk11u-dev/pull/1158/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1158&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8219149
  Stats: 21 lines in 1 file changed: 19 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1158.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1158/head:pull/1158

PR: https://git.openjdk.org/jdk11u-dev/pull/1158