[jdk17] RFR: 8268564: mark hotspot serviceability/attach tests which ignore external VM flags

[Igor Ignatyev]

Hi all,

could you please review this one-liner that adds `@requires vm.flagless` to 2 `serviceability/attach` tests that ignore external VM flags?

Thanks,
-- Igor

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Commit messages:
 - 8268564

Changes: https://git.openjdk.java.net/jdk17/pull/8/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=8&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268564
  Stats: 4 lines in 2 files changed: 3 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/8.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/8/head:pull/8

PR: https://git.openjdk.java.net/jdk17/pull/8