Add OpenJ9PropsExt properties for serviceability_jvmti_j9

vm.cds is set to false for
serviceability/jvmti/CanGenerateAllClassHook/CanGenerateAllClassHook.java
which is specific to hotspot sharedclass;
vm.flagless is set to true for
serviceability/jvmti/RedefineClasses/RedefineLeak.java which OpenJ9
passes;
vm.opt.final.ClassUnloading is set to false for
serviceability/jvmti/RedefineClasses/RedefinePreviousVersions.java which
looks for a hotspot specific "Class unloading: has_previous_versions =
false".

Signed-off-by: Jason Feng <fengj@ca.ibm.com>

closed/test/jtreg-ext/requires/OpenJ9PropsExt.java

@@ -37,8 +37,10 @@ public Map<String, String> call() {
  Map<String, String> map = new HashMap<>();
  try {
  map.put("vm.bits", vmBits());
+ map.put("vm.cds", "false");
  map.put("vm.compiler2.enabled", "false");
  map.put("vm.continuations", "false");
+ map.put("vm.flagless", "true");
  map.put("vm.gc.G1", "false");
  map.put("vm.gc.Parallel", "false");
  map.put("vm.gc.Serial", "false");
@@ -49,6 +51,7 @@ public Map<String, String> call() {
  map.put("vm.jvmti", "true");
  map.put("vm.musl", "false");
  map.put("vm.openj9", "true");
+ map.put("vm.opt.final.ClassUnloading", "false");
  }
  catch (Exception e) {
  e.printStackTrace();