[jdk11u-dev] RFR: 8221902: PIT: javax/swing/JRadioButton/FocusTraversal/FocusTraversal.java fails on ubuntu

[Goetz Lindenmaier]

I downport this for parity with 11.0.13-oracle.

Applied clean except for context in ProblemList.txt.

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Commit messages:
 - Backport 4071546506d33b2bf74dc811b28dd8653f315be6

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/399/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=399&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8221902
  Stats: 4 lines in 2 files changed: 3 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/399.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/399/head:pull/399

PR: https://git.openjdk.java.net/jdk11u-dev/pull/399