RFR: 7903738 : jtr.xml logs produced with -xml argument do not contain compilation failure justification - alternative approach [v2]

[andrlos]

> this is an alternative to https://github.com/openjdk/jtreg/pull/198
> here we are collecting all the System.err outputs and putting them into a StringBuilder and returning them as one long string..
> Order of the sections should be intact, so it should go chronologically according to the test execution.
> This could be also improved by adding section separator Strings into the StringBuilder between individual sections.
> Also we could drop the `if (titles[i].equals("main") || ...` part and output any System.err output found in jtr.xml as part of the test failure

andrlos has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  alternative approach to jtr.xml transcription

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Changes:
  - all: https://git.openjdk.org/jtreg/pull/199/files
  - new: https://git.openjdk.org/jtreg/pull/199/files/d2fd6b55..7ced8369

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jtreg&pr=199&range=01
 - incr: https://webrevs.openjdk.org/?repo=jtreg&pr=199&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jtreg/pull/199.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/199/head:pull/199

PR: https://git.openjdk.org/jtreg/pull/199