RFR: 8286844: com/sun/jdi/RedefineCrossEvent.java failed with 1 threads completed while VM suspended

[Alex Menkov]

The test verifies that JDI threads are daemon threads.
But enumerating threads at breakpoint it performs sanity check that all threads returned by ThreadGroup.enumerate hasn't terminated.
But this is wrong assumption,  as the test enumerates _debugger_ threads and not _debuggee_ threads.

The fix drops this sanity check.

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Commit messages:
 - removed incorrect check from the test

Changes: https://git.openjdk.org/jdk/pull/9547/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9547&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8286844
  Stats: 7 lines in 1 file changed: 0 ins; 6 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9547.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9547/head:pull/9547

PR: https://git.openjdk.org/jdk/pull/9547