[jdk8u-dev] RFR: 8239827: The test OpenByUNCPathNameTest.java should be changed to be manual

[Sergey Bylokhov]

The fix for a test bug.

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Commit messages:
 - Backport 7cc3ba5f9b188e5dd298dbcde3934d08b6101032

Changes: https://git.openjdk.org/jdk8u-dev/pull/243/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=243&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8239827
  Stats: 156 lines in 1 file changed: 105 ins; 25 del; 26 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/243.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/243/head:pull/243

PR: https://git.openjdk.org/jdk8u-dev/pull/243