RFR: 8301798: [BACKOUT] jdb ThreadStartRequest and ThreadDeathRequest should use SUSPEND_NONE instead of SUSPEND_ALL

[Chris Plummer]

Backing out the following due to numerous failing tests. There will be no redo. The original change was an enhancement, not a bug fix.

[JDK-8300811](https://bugs.openjdk.org/browse/JDK-8300811) jdb ThreadStartRequest and ThreadDeathRequest should use SUSPEND_NONE instead of SUSPEND_ALL

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Commit messages:
 - Revert "8300811: jdb ThreadStartRequest and ThreadDeathRequest should use SUSPEND_NONE instead of SUSPEND_ALL"

Changes: https://git.openjdk.org/jdk/pull/12416/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12416&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301798
  Stats: 4 lines in 1 file changed: 0 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12416.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12416/head:pull/12416

PR: https://git.openjdk.org/jdk/pull/12416