Merge pull request ibmruntimes#372 from JasonFengJ9/vmflagless

JDK17 adds OpenJ9 properties vm.flagless

Author: keithc-ca

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

@@ -40,6 +40,7 @@ public Map<String, String> call() {
             map.put("vm.bits", vmBits());
             map.put("vm.compiler2.enabled", "false");
             map.put("vm.debug", "false");
+            map.put("vm.flagless", "true");
             map.put("vm.gc.G1", "false");
             map.put("vm.gc.Parallel", "false");
             map.put("vm.gc.Serial", "false");