RFR: CODETOOLS-7903083: Provide system property or option to override timeout

[Jonathan Gibbons]

This is a PR to disable timeouts when test debug options have been set.

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

Commit messages:
 - CODETOOLS-7903083: Provide system property or option to override timeout

Changes: https://git.openjdk.java.net/jtreg/pull/47/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jtreg&pr=47&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903083
  Stats: 35 lines in 4 files changed: 17 ins; 5 del; 13 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/47.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/47/head:pull/47

PR: https://git.openjdk.java.net/jtreg/pull/47