Clean up ClusterRoleBindings (istio#732)

* Clean up ClusterRoleBindings

* Fix linter

* Check file exists


Former-commit-id: 64198ed

tests/e2e/framework/kubernetes.go

@@ -138,6 +138,17 @@ func (k *KubeInfo) Setup() error {
 func (k *KubeInfo) Teardown() error {
 	glog.Info("Cleaning up kubeInfo")
 	var err error
+
+	if *rbacfile != "" {
+
+		testRbacYaml := filepath.Join(k.TmpDir, "yaml", filepath.Base(*rbacfile))
+		if _, err = os.Stat(testRbacYaml); os.IsNotExist(err) {
+			glog.Errorf("%s File does not exist", testRbacYaml)
+		} else if err = util.KubeDelete(k.Namespace, testRbacYaml); err != nil {
+			glog.Errorf("Rbac deletion failed, please remove stale ClusterRoleBindings")
+		}
+	}
+
 	if k.namespaceCreated {
 		if err = util.DeleteNamespace(k.Namespace); err != nil {
 			glog.Errorf("Failed to delete namespace %s", k.Namespace)