Fixed lack of context for triggers

If set auth_enable to false in Mistral config keystone would not be used. So
triggers would not get a trust_id. Without this id context is not assigned.

Change-Id: I6d7d99da08cd78c1db83afff6fb79d37816f99ff
Closes-Bug: #1473980

mistral/services/security.py

@@ -61,8 +61,6 @@ def create_context(trust_id, project_id):
     :param project_id: Project Id.
     :return: Mistral security context.
     """
-    if not trust_id:
-        return
 
     if CONF.pecan.auth_enable:
         client = keystone.client_for_trusts(trust_id)

mistral/tests/unit/engine/test_cron_trigger.py

@@ -70,3 +70,27 @@ class ProcessCronTriggerTest(base.EngineTestCase):
         # Checking the workflow was executed, by
         # verifying that the next execution time changed.
         self.assertNotEqual(next_execution_before, next_execution_after)
+
+    def test_workflow_without_auth(self):
+        cfg.CONF.set_default('auth_enable', False, group='pecan')
+        wf = workflows.create_workflows(WORKFLOW_LIST)[0]
+
+        t_s.create_cron_trigger(
+            'test',
+            wf.name,
+            {},
+            {},
+            '* * * * * */1',
+            None,
+            None,
+            None
+        )
+        m_p_t = periodic.MistralPeriodicTasks(cfg.CONF)
+        next_cron_trigger = t_s.get_next_cron_triggers()[0]
+        next_execution_before = next_cron_trigger.next_execution_time
+        m_p_t.process_cron_triggers_v2(None)
+
+        next_cron_trigger = t_s.get_next_cron_triggers()[0]
+        next_execution_after = next_cron_trigger.next_execution_time
+
+        self.assertNotEqual(next_execution_before, next_execution_after)