RFR: Fixes of vmTestbase tests for loom

Tue Apr 7 03:15:12 UTC 2020

Fixes of nsk/stress/strace and nsk/monitoring/ThreadMXBean tests for loom

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Commit messages:
 - nsk/monitoring/ThreadMXBean tests updated for loom.
 - NSK stress/strace more relaxed.
 - NSK stress/strace tests updated for loom.

Changes: https://git.openjdk.java.net/loom/pull/11/files
 Webrev: https://webrevs.openjdk.java.net/loom/11/webrev.00
  Stats: 59 lines in 16 files changed: 26 ins; 0 del; 33 mod
  Patch: https://git.openjdk.java.net/loom/pull/11.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/11/head:pull/11

PR: https://git.openjdk.java.net/loom/pull/11