RFR: JDK-8310191: com/sun/tools/attach/warnings/DynamicLoadWarningTest.java second failure on AIX [v2]

[Matthias Baesken]

> After push of [JDK-8307478](https://bugs.openjdk.org/browse/JDK-8307478) , the following test started to fail on AIX :
> com/sun/tools/attach/warnings/DynamicLoadWarningTest.java ; failure output :
> 
> java.lang.RuntimeException: 'WARNING: A JVM TI agent has been loaded dynamically' found in stderr
> at jdk.test.lib.process.OutputAnalyzer.stderrShouldNotContain(OutputAnalyzer.java:320)
> at DynamicLoadWarningTest$AppRunner.stderrShouldNotContain(DynamicLoadWarningTest.java:308)
> at DynamicLoadWarningTest.testLoadOneJvmtiAgent(DynamicLoadWarningTest.java:138)
> at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
> at java.base/java.lang.reflect.Method.invoke(Method.java:580)
> 
> Should be handled in a similar way to [JDK-8309549](https://bugs.openjdk.org/browse/JDK-8309549) .

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  Rearrange and simplify test coding

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/14515/files
  - new: https://git.openjdk.org/jdk/pull/14515/files/8694eb48..af005ebc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14515&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14515&range=00-01

  Stats: 15 lines in 1 file changed: 6 ins; 8 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14515.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14515/head:pull/14515

PR: https://git.openjdk.org/jdk/pull/14515