Add ou to security service tests

This patch complements I70fd4e0ea7898e85dff59a927b3cb086d5e408ac
by adding tests for ou parameter at security services with new
microversion 2.44.

Depends-On: I70fd4e0ea7898e85dff59a927b3cb086d5e408ac
Change-Id: I77d87c8e6f98054f2f02bc4202c14314ff321964
Partial-Bug: #1696669
diff --git a/manila_tempest_tests/config.py b/manila_tempest_tests/config.py
index 4e6c99b..e737cb4 100644
--- a/manila_tempest_tests/config.py
+++ b/manila_tempest_tests/config.py
@@ -30,7 +30,7 @@
                help="The minimum api microversion is configured to be the "
                     "value of the minimum microversion supported by Manila."),
     cfg.StrOpt("max_api_microversion",
-               default="2.42",
+               default="2.44",
                help="The maximum api microversion is configured to be the "
                     "value of the latest microversion supported by Manila."),
     cfg.StrOpt("region",