RFR: 8279005: sun/tools/jstat tests do not check for test case exit codes after JDK-8245129 [v2]

[Paul Hohensee]

> Please review a jstat test-only fix.
> 
> 1. Ensure that jstat tests that run more than one sub-test per test file check the result of each sub-test before continuing.
> 2. Allow '-' as a valid jstat -gcutil heap space percent occupancy field value, see lineCounts[1-4].awk. Occupancy is computed as ((capacity - used) / capacity), see src/jdk.jcmd/share/classes/sun/tools/jstat/resources/jstat_options, search for "gcutil". G1, ZGC, and Shenandoah may return zero capacity for any or all of survivor spaces, eden, old gen, metaspace, and compressed class space, leading to an occupancy result represented by '-'.
> 
> Modified tests pass.

Paul Hohensee 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 'master' into 8279005
 - 8279005: sun/tools/jstat tests do not check for test case exit codes after JDK-8245129

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25951/files
  - new: https://git.openjdk.org/jdk/pull/25951/files/201f1f5e..1b9b31b6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25951&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25951&range=00-01

  Stats: 2863 lines in 190 files changed: 1035 ins; 520 del; 1308 mod
  Patch: https://git.openjdk.org/jdk/pull/25951.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25951/head:pull/25951

PR: https://git.openjdk.org/jdk/pull/25951