<Swing Dev> RFR: 8254976: Re-enable swing jtreg tests which were broken due to samevm mode

[Prasanta Sadhukhan]

Few tests were problemlisted in an earlier test sprint due to those failing in mach5 testing.
It was found out that these test were failing due to those jtreg tests being run in same vm mode.
The bug was fixed by the adding client tests to the "othervm.dirs" in the TEST.ROOT so there is no need to keep those
tests problem listed. mach5 job running these tests was ok. Link in JBS.

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

Commit messages:
 - Revert test change
 - 8254976: Re-enable swing jtreg tests which were broken due to samevm mode
 - 8196090: javax/swing/JComboBox/6559152/bug6559152.java fails

Changes: https://git.openjdk.java.net/jdk/pull/733/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=733&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254976
  Stats: 20 lines in 1 file changed: 0 ins; 20 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/733.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/733/head:pull/733

PR: https://git.openjdk.java.net/jdk/pull/733