Switch to use test_utils.call_until_true

test.call_until_true has been deprecated since Newton on Tempest side,
and now Tempest provides test_utils.call_until_true as the stable
library method. So this patch switches to use the stable method before
removing old test.call_until_true on Tempest side.

Change-Id: Iba2130aca93c8e6bccb4f8ed169424c791ebc127
Needed-by: Ide11a7434a4714e5d2211af1803333535f557370

watcher_tempest_plugin/tests/api/admin/test_action.py

@@ -19,6 +19,7 @@ from __future__ import unicode_literals
 import collections
 import functools
 
+from tempest.lib.common.utils import test_utils
 from tempest import test
 
 from watcher_tempest_plugin.tests.api.admin import base
@@ -34,7 +35,7 @@ class TestShowListAction(base.BaseInfraOptimTest):
         _, cls.audit_template = cls.create_audit_template(cls.goal['uuid'])
         _, cls.audit = cls.create_audit(cls.audit_template['uuid'])
 
-        assert test.call_until_true(
+        assert test_utils.call_until_true(
             func=functools.partial(cls.has_audit_finished, cls.audit['uuid']),
             duration=30,
             sleep_for=.5