RFR: 8268532: several serviceability/attach tests should be run in driver mode

[Igor Ignatyev]

Hi all,

could you please review this small patch that switches execution mode in 4 `serviceability/attach` tests?
in all instances, the main test classes seem not to do actual testing and just orchestrate execution.

testing: `serviceability/attach` on `{linux,windows,macosx}-x64`

Thanks,
-- Igor

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Commit messages:
 - one more test
 - copyright year
 - 8268532

Changes: https://git.openjdk.java.net/jdk/pull/4455/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4455&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268532
  Stats: 8 lines in 4 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4455.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4455/head:pull/4455

PR: https://git.openjdk.java.net/jdk/pull/4455