JavaVersion.isIBMJvm() incorrect or need isOpenJ9Jvm()

JdiTest suite assume if isIBMJvm() is true it can use jdwp trace=.. options, but they are not supported for OpenJ9:
```
ASI2 stderr ERROR: JDWP option syntax error: -agentlib:jdwp=transport=dt_socket,address=30001,server=y,timeout=300000,trace=PROG+CMD+PACK+DATA
```
Either IBMJvm() means IBMSDK only, or JdiTest needs a JavaVersion.isOpenJ9Jvm() method?

Start by inspecting JavaVersion.isIBMJvm() and the JdiTest suite mentioned in the issue, then reproduce the JDWP trace-option error on OpenJ9. Determine the intended distinction between IBM SDK and OpenJ9, and consider the work complete when JdiTest no longer applies unsupported options while the JVM detection behavior is covered by tests.

Written by the indexing model from the issue text.