RFR: 8247980: Exclusive execution of java/util/stream tests slows down tier1

[Aleksey Shipilev]

See the bug report for more details. I would appreciate if people with their corporate testing systems would run this through their systems to avoid surprises. (ping @RealCLanger, @iignatev).

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Commit messages:
 - Drop stream tests exclusivity

Changes: https://git.openjdk.java.net/jdk/pull/5189/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5189&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8247980
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5189.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5189/head:pull/5189

PR: https://git.openjdk.java.net/jdk/pull/5189