[jdk17u-dev] RFR: 8269770: nsk tests should start IOPipe channel before launch debuggee - Debugee.prepareDebugee

[Goetz Lindenmaier]

I backport this for parity with 17.0.14-oracle.

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Commit messages:
 - Backport 18a731a3e4ec85f0f3e8d6ff619b539c0daaf320

Changes: https://git.openjdk.org/jdk17u-dev/pull/2850/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2850&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8269770
  Stats: 31 lines in 3 files changed: 4 ins; 19 del; 8 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2850.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2850/head:pull/2850

PR: https://git.openjdk.org/jdk17u-dev/pull/2850