Fix preinstalled workflows tests

The 'std' prefix was removed from the workflow name
make sure it passes on both cases.

Change-Id: I9bd36bf2ad1a36ff569f385190c186b63b78f1e1

mistral_tempest_tests/tests/api/v2/test_workflows.py

@@ -44,7 +44,7 @@ class WorkflowTestsV2(base.TestCase):
 
         names = [wf['name'] for wf in body['workflows']]
 
-        self.assertIn('std.create_instance', names)
+        self.assertPartIn('create_instance', names)
 
         self.assertNotIn('next', body)
 

mistral_tempest_tests/tests/base.py

@@ -59,6 +59,9 @@ class TestCase(test.BaseTestCase):
             self.alt_client = mistral_client.MistralClientV2(
                 self.alt_mgr.auth_provider, self._service)
 
+    def assertPartIn(self, needle, haystack, message=''):
+        self.assertTrue(any(needle in s for s in haystack), message)
+
     def tearDown(self):
         super(TestCase, self).tearDown()