RFR: 7903872: Option testThreadFactoryPath support relativepath [v2]

[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:

  use NIO instead of java.io.path

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

Changes:
  - all: https://git.openjdk.org/jtreg/pull/233/files
  - new: https://git.openjdk.org/jtreg/pull/233/files/0351e462..3e1115e7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jtreg&pr=233&range=01
 - incr: https://webrevs.openjdk.org/?repo=jtreg&pr=233&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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