[jdk11u-dev] RFR: 8190748: java/text/Format/DateFormat/DateFormatTest.java and NonGregorianFormatTest fail intermittently

[Goetz Lindenmaier]

I backport this for parity with 11.0.15-oracle.

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Commit messages:
 - Backport f1c20e91d822c6df4c5da895f2abd6305e00bf8b

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/814/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=814&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8190748
  Stats: 12 lines in 2 files changed: 6 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/814.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/814/head:pull/814

PR: https://git.openjdk.java.net/jdk11u-dev/pull/814