[jdk11u-dev] RFR: 8207211: [TESTBUG] Remove excessive output from CDS/AppCDS tests

[Amos Shi]

- Backport of [JDK-8207211](https://bugs.openjdk.org/browse/JDK-8207211)
- `test/lib/jdk/test/lib/cds/CDSTestUtils.java` - added `getTestName()` method for the back port code

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Commit messages:
 - Backport c3adb5f87d6af6345bf9cd047d2c378ecdd7ede7

Changes: https://git.openjdk.org/jdk11u-dev/pull/2314/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2314&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8207211
  Stats: 66 lines in 14 files changed: 24 ins; 17 del; 25 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2314.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2314/head:pull/2314

PR: https://git.openjdk.org/jdk11u-dev/pull/2314