[jdk11u-dev] RFR: 8256154: Some TestNG tests require default constructors

[Goetz Lindenmaier]

I backport this for parity with 11.0.15-oracle.

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Commit messages:
 - Backport 5ed704484eae23a8b3feb1ac705d23b5eb0dfc40

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/747/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=747&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256154
  Stats: 13 lines in 2 files changed: 11 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/747.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/747/head:pull/747

PR: https://git.openjdk.java.net/jdk11u-dev/pull/747