[jdk17u-dev] RFR: 8337851: Some tests have name which confuse jtreg

[toshiogata]

Hi all,

I would like to backport this patch because the reported jtreg issue is reproducible in JDK17.
The original patch applies cleanly.

Although the test/langtools/tools/javac/warnings/Serial directory were introduced in JDK 18 and the associated jtreg issues for that directory is not present in JDK 17, Serial.java and Serial.out have been renamed to minimize differences.

Testing: the related tests with "-retain:all" option, and all tests under tools/javac 

Thank you

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Commit messages:
 - Backport e6698f51a1977d553ce4e1dd14b43b0d325224fa

Changes: https://git.openjdk.org/jdk17u-dev/pull/3018/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3018&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337851
  Stats: 0 lines in 4 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3018.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3018/head:pull/3018

PR: https://git.openjdk.org/jdk17u-dev/pull/3018