RFR: 8249623: test @ignore-d due to 7013634 should be returned back to exe…

[Alex Menkov]

- updated timeout/stressTime for resexhausted001 test so on Windows we get "can't reproduce OOME" instead of timeout;
- updated resexhausted001 cleanup code (to terminate all threads);
- intermittent resexhausted001 failure on linux is problem-listed;
- updated resexhausted001 and resexhausted002 to throw SkippedException if OOM is not thrown

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Commit messages:
 - 8249623: test @ignore-d due to 7013634 should be returned back to execution

Changes: https://git.openjdk.java.net/jdk/pull/551/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=551&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8249623
  Stats: 12 lines in 4 files changed: 4 ins; 2 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/551.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/551/head:pull/551

PR: https://git.openjdk.java.net/jdk/pull/551