[jdk11u-dev] RFR: 8256066: Tests use deprecated TestNG API that is no longer available in new versions

[Martin Doerr]

Clean backport of JDK-8256066.

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Commit messages:
 - Backport 6d8acd2696f41918d4233ddffe46e6c205f9dbc3

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/367/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=367&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256066
  Stats: 12 lines in 3 files changed: 0 ins; 6 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/367.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/367/head:pull/367

PR: https://git.openjdk.java.net/jdk11u-dev/pull/367