Share V2 skip condition via RequiresV2Api

Move the SKIP_V2_TESTS check into a reusable static method in
V2ApiCondition.

Author: jorbaum

integration-test/src/test/java/org/cloudfoundry/CloudFoundryCleaner.java

@@ -131,11 +131,7 @@ final class CloudFoundryCleaner implements InitializingBean, DisposableBean {
 
     private static final Logger LOGGER = LoggerFactory.getLogger("cloudfoundry-client.test");
 
-    private static final boolean RUN_V2_CLEANUP = isRunV2Tests();
-
-    private static boolean isRunV2Tests() {
-        return !"true".equalsIgnoreCase(System.getenv(RequiresV2Api.SKIP_V2_TESTS_ENV));
-    }
+    private static final boolean RUN_V2_CLEANUP = RequiresV2Api.V2ApiCondition.isEnabled();
 
     private static final Map<String, Boolean> STANDARD_FEATURE_FLAGS =
             FluentMap.<String, Boolean>builder()

integration-test/src/test/java/org/cloudfoundry/RequiresV2Api.java

@@ -59,9 +59,14 @@
      */
     class V2ApiCondition implements ExecutionCondition {
 
+        /** Returns {@code true} if V2 API tests should run (i.e., not skipped). */
+        public static boolean isEnabled() {
+            return !"true".equalsIgnoreCase(System.getenv(SKIP_V2_TESTS_ENV));
+        }
+
         @Override
         public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context) {
-            if ("true".equalsIgnoreCase(System.getenv(SKIP_V2_TESTS_ENV))) {
+            if (!isEnabled()) {
                 return ConditionEvaluationResult.disabled(
                         "V2 API tests are disabled via "
                                 + SKIP_V2_TESTS_ENV