RFR: 8256364: vmTestbase/nsk/jvmti/scenarios/capability/CM01/cm01t002 failed with "assert(handle != __null) failed: JNI handle should not be null"

[Alex Menkov]

Resending the RFR without unexpected extra commits

- fixed java part of the test to handle spurious wakeups in the debuggee thread;
- fixed native part of the test to detect and report the case when debuggee thread not found.

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Commit messages:
 - Fixed cm01t002

Changes: https://git.openjdk.java.net/jdk/pull/1361/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1361&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256364
  Stats: 17 lines in 2 files changed: 14 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1361.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1361/head:pull/1361

PR: https://git.openjdk.java.net/jdk/pull/1361