New cron type for audit interval

This patch set adds cron supporting for audit.

Implements: blueprint cron-based-continuous-audits
Change-Id: I8570bebb13332dfba80185e912aeda45b6b4cd70

watcher_tempest_plugin/tests/api/admin/base.py

@@ -171,7 +171,7 @@ class BaseInfraOptimTest(test.BaseTestCase):
         :param audit_template_uuid: Audit Template UUID this audit will use
         :param audit_type: Audit type (either ONESHOT or CONTINUOUS)
         :param state: Audit state (str)
-        :param interval: Audit interval in seconds (int)
+        :param interval: Audit interval in seconds or cron syntax (str)
         :return: A tuple with The HTTP response and its body
         """
         resp, body = cls.client.create_audit(

watcher_tempest_plugin/tests/api/admin/test_audit.py

@@ -63,7 +63,7 @@ class TestCreateUpdateDeleteAudit(base.BaseInfraOptimTest):
         audit_params = dict(
             audit_template_uuid=audit_template['uuid'],
             audit_type='CONTINUOUS',
-            interval=7200,
+            interval='7200',
         )
 
         _, body = self.create_audit(**audit_params)