[jdk11u-dev] RFR: 8275170: Some jtreg sound tests should be marked with sound keyword

[Goetz Lindenmaier]

I backport this for parity with 11.0.18-oracle.

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Commit messages:
 - Backport 25669bb667466b3cc814f8f08d4e3a2982a4cf2e

Changes: https://git.openjdk.org/jdk11u-dev/pull/1371/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1371&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8275170
  Stats: 63 lines in 58 files changed: 59 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1371.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1371/head:pull/1371

PR: https://git.openjdk.org/jdk11u-dev/pull/1371