[jdk15u-dev] Integrated: 8256066: Tests use deprecated TestNG API that is no longer available in new versions

[Yuri Nesterenko]

Three tests fixed for newer TestNG. Works now with latest jtreg as well as jtreg 5.1

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Commit messages:
- Backport 6d8acd2696f41918d4233ddffe46e6c205f9dbc3

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/151/files
Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=151&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/jdk15u-dev/pull/151.diff
Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/151/head:pull/151

PR: https://git.openjdk.java.net/jdk15u-dev/pull/151