RFR: 7903872: Option testThreadFactoryPath support relativepath [v3]

[SendaoYan]

> Hi all,
> Currently, the jtreg option `-testThreadFactoryPath` doesn't support relativepath.
> I think jtreg can support relativepath for option `-testThreadFactoryPath`, same like to `-jdk` or `-nativepath`.
> Change has been verified locally, risk is low.

SendaoYan has updated the pull request incrementally with one additional commit since the last revision:

  add testcase TestThreadFactoryRelativePath.ok

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

Changes:
  - all: https://git.openjdk.org/jtreg/pull/233/files
  - new: https://git.openjdk.org/jtreg/pull/233/files/3e1115e7..193923a4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jtreg&pr=233&range=02
 - incr: https://webrevs.openjdk.org/?repo=jtreg&pr=233&range=01-02

  Stats: 30 lines in 1 file changed: 27 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jtreg/pull/233.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/233/head:pull/233

PR: https://git.openjdk.org/jtreg/pull/233