RFR: CODETOOLS-7903117: Remove JCov support from jtreg

Mon Feb 28 23:28:37 UTC 2022

Please review a change to remove "effectively-dead" support for JCov from jtreg.

Introduced for JDK 8, the code was broken by the introduction of modules (which would have required updates to JCov to fix), but has now been superseded by better support within the JDK build itself, as detailed in JDK `doc/building.md`.

The time has therefore come to remove this old code from jtreg.

Thanks one last time to the engineers who provided the support when this code was added.

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Commit messages:
 - CODETOOLS-7903117: Remove JCov support from jtreg

Changes: https://git.openjdk.java.net/jtreg/pull/62/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jtreg&pr=62&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903117
  Stats: 1338 lines in 17 files changed: 15 ins; 1261 del; 62 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/62.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/62/head:pull/62

PR: https://git.openjdk.java.net/jtreg/pull/62