Update feature flag handling for required features

- Removed `null` statement from `required` feature check to ensure all required features are processed.
- Allows the code to continue checking all feature flags, even after finding a required flag in `testFlags`.

related:https://github.ibm.com/runtimes/backlog/issues/1525

Signed-off-by: Anna Babu Palathingal <anna.bp@ibm.com>

src/org/testKitGen/TestInfoParser.java

@@ -91,8 +91,8 @@ public TestInfo parse() {
  for (Map.Entry<String,String> entry : ti.getFeatures().entrySet()) {
  String featureOpt = entry.getValue().toLowerCase();
  if (featureOpt.equals("required")) {
- if (!isFeatureInTestFlags(testFlags, entry.getKey())) {
- return null;
+ if (isFeatureInTestFlags(testFlags, entry.getKey())) {
+ break;
  }
  } else if (featureOpt.equals("nonapplicable")) {
  // Do not generate make target if the test is not applicable for one feature defined in TEST_FLAG