[jdk11u-dev] RFR: 8221396: Clean up serviceability/sa/TestUniverse.java

[toshiogata]

Hi all,

This is a backport of JDK-8221396: Clean up serviceability/sa/TestUniverse.java  
I would like to backport this enhancement to jdk11u for test maintainability.

The original patch does not apply cleanly to jdk11u, because JDK-8238268 was backported ahead. As for TestUniverse.java, JDK-8238268 simply changes `@requires vm.hasSAandCanAttach` to `@requires vm.hasSA`, and the identical change can be safely applied to this patch.

The risk is low as this fix only affects testing.  
There is a related Issue: JDK-8231931, and I submit the corresponding PR. Testing was done after applying this related patch.  
Testing: the affected test under all available GCs.

Thank you.

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Commit messages:
 - Backport 229d923b27a6c01616291aea6c8d4c86930bf7d2

Changes: https://git.openjdk.org/jdk11u-dev/pull/2148/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2148&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8221396
  Stats: 92 lines in 1 file changed: 42 ins; 34 del; 16 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2148.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2148/head:pull/2148

PR: https://git.openjdk.org/jdk11u-dev/pull/2148