RFR: 7903159: Make jtreg self-tests run on Windows/Cygwin [v2]

[Christian Stein]

> Prior to this commit some of `jtreg`'s self-tests failed on Windows/Cygwin systems.
> 
> This commit fixes this mainly by adjusting assertions expecting Windows-style paths, `\r\n` line-breaks, and ignoring/normalizing other differences compared to Unix-based systems.
> 
> https://bugs.openjdk.java.net/browse/CODETOOLS-7903159

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

  Fix typo

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

Changes:
  - all: https://git.openjdk.java.net/jtreg/pull/74/files
  - new: https://git.openjdk.java.net/jtreg/pull/74/files/901be16c..d19e9cc6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jtreg&pr=74&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jtreg&pr=74&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/74.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/74/head:pull/74

PR: https://git.openjdk.java.net/jtreg/pull/74