RFR: 8273928: Use named run ids when problem listing tests

[Stefan Karlsson]

Today when you have multiple jtreg run sections in a test, each run gets an automated id that match the location in the file. For example:
Passed: gc/stringdedup/TestStringDeduplicationAgeThreshold.java#id0
Passed: gc/stringdedup/TestStringDeduplicationAgeThreshold.java#id1
Passed: gc/stringdedup/TestStringDeduplicationAgeThreshold.java#id2
Passed: gc/stringdedup/TestStringDeduplicationAgeThreshold.java#id3

The path to the test plus the id can be used to problem lists the test. Say that id3 matches a run done with ZGC, and we need to problem list this test with ZGC, then the problem list would contain:
gc/stringdedup/TestStringDeduplicationAgeThreshold.java#id3

The problem is when someone adds a new run section before that, then all the ids will be shifted and #id3 doesn't correspond to the ZGC run anymore. A similar problem occurs if two run sections are swapped.

I propose that we refrain from using the automatically generated ids when problem listing tests. Instead we add explicit ids like this:
* @test id=Z

An additional benefit of doing this is that it will be easier to see what was actually run:
Passed: gc/stringdedup/TestStringDeduplicationAgeThreshold.java#G1
Passed: gc/stringdedup/TestStringDeduplicationAgeThreshold.java#Parallel
Passed: gc/stringdedup/TestStringDeduplicationAgeThreshold.java#Serial
Passed: gc/stringdedup/TestStringDeduplicationAgeThreshold.java#Z

I've gone through the tests in the HotSpot problem lists + some that affects ZGC. There are probably more tests that would benefit from getting explicit ids, but I started with a small set to begin with.

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Commit messages:
 - 8273928: Use named run ids when problem listing tests

Changes: https://git.openjdk.java.net/jdk/pull/5557/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5557&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273928
  Stats: 102 lines in 17 files changed: 29 ins; 1 del; 72 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5557.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5557/head:pull/5557

PR: https://git.openjdk.java.net/jdk/pull/5557