hack disable v1beta2 api

Author: Phaow

release-tools/prow.sh

@@ -564,7 +564,7 @@ list_api_groups () (
         echo '   "api/ga": "true"'
         echo '   "storage.k8s.io/v1alpha1": "true"'
         echo '   "storage.k8s.io/v1beta1": "true"'
-        echo '   "storage.k8s.io/v1beta2": "true"'
+        # echo '   "storage.k8s.io/v1beta2": "true"'
     fi
 
     # Ignore: Double quote to prevent globbing and word splitting.