RFR: 8367795: HeadlessMalfunctionTest may fail due to timeout [v2]

[Sergey Bylokhov]

> The default timeout factor for tests was changed by [JDK-8260555](https://bugs.openjdk.org/browse/JDK-8260555). Since then, the HeadlessMalfunctionTest may occasionally fail on some systems when run in parallel with other tests. When executed alone, it usually completes in 30–40 seconds, but under CPU spikes it can take up to ~120 seconds, which can occasionally cause it to fail.

Sergey Bylokhov has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into JDK-8367795
 - 8367795: HeadlessMalfunctionTest may fail due to timeout

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27397/files
  - new: https://git.openjdk.org/jdk/pull/27397/files/1a5522d0..d2aa04c4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27397&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27397&range=00-01

  Stats: 133951 lines in 1179 files changed: 117280 ins; 10857 del; 5814 mod
  Patch: https://git.openjdk.org/jdk/pull/27397.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27397/head:pull/27397

PR: https://git.openjdk.org/jdk/pull/27397