RFR: 7903935: --verify-exclude existence check misses tests with failing requires

[Ludvig Janiuk]

7903935: --verify-exclude existence check misses tests with failing requires

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Commit messages:
 - Update comment
 - 7903935 --verify-exclude existence check misses tests with failing requires

Changes: https://git.openjdk.org/jtreg/pull/243/files
  Webrev: https://webrevs.openjdk.org/?repo=jtreg&pr=243&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903935
  Stats: 10 lines in 1 file changed: 9 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jtreg/pull/243.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/243/head:pull/243

PR: https://git.openjdk.org/jtreg/pull/243