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_audit.py

@@ -18,6 +18,7 @@ from __future__ import unicode_literals
 
 import functools
 
+from tempest.lib.common.utils import test_utils
 from tempest.lib import exceptions
 from tempest import test
 
@@ -125,7 +126,7 @@ class TestCreateUpdateDeleteAudit(base.BaseInfraOptimTest):
         _, body = self.create_audit(audit_template['uuid'])
         audit_uuid = body['uuid']
 
-        test.call_until_true(
+        test_utils.call_until_true(
             func=functools.partial(
                 self.is_audit_idle, audit_uuid),
             duration=10,
@@ -140,7 +141,7 @@ class TestCreateUpdateDeleteAudit(base.BaseInfraOptimTest):
 
         self.delete_audit(audit_uuid)
 
-        test.call_until_true(
+        test_utils.call_until_true(
             func=functools.partial(is_audit_deleted, audit_uuid),
             duration=5,
             sleep_for=1