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

Wed Apr 13 19:45:08 UTC 2022

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

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Commit messages:
 - 7903159: Make jtreg self-tests run on Windows/Cygwin

Changes: https://git.openjdk.java.net/jtreg/pull/74/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jtreg&pr=74&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903159
  Stats: 49 lines in 22 files changed: 8 ins; 0 del; 41 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