RFR: 8255898: Test java/awt/FileDialog/FilenameFilterTest/FilenameFilterst.java fails on Mac OS

[Jayathirth D V]

Root cause for this test failure in our CI systems was macOS regression in specific version of Catalina.
This issue is fixed in macOS 10.12 Catalina Beta7 (19A546d) and it is no longer failing after multiple individual test runs as well as multiple FileDialog jtreg test bunch run in our CI systems.

I have added details of similar issue faced in this Catalina version by other applications in the JBS. Some of these observations talk about permission issues when running the application, so to be on safer side i have updated test case to run on othervm mode.

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Commit messages:
 - 8255898: Test java/awt/FileDialog/FilenameFilterTest/FilenameFilterTest.java fails on Mac OS

Changes: https://git.openjdk.java.net/jdk/pull/5986/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5986&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255898
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5986.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5986/head:pull/5986

PR: https://git.openjdk.java.net/jdk/pull/5986