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/tests/api/base.py b/manila_tempest_tests/tests/api/base.py
index d8bd45a..5fa187a 100644
--- a/manila_tempest_tests/tests/api/base.py
+++ b/manila_tempest_tests/tests/api/base.py
@@ -1030,7 +1030,7 @@
         return data
 
     @classmethod
-    def generate_security_service_data(self):
+    def generate_security_service_data(self, set_ou=False):
         data = {
             "name": data_utils.rand_name("ss-name"),
             "description": data_utils.rand_name("ss-desc"),
@@ -1040,6 +1040,9 @@
             "user": data_utils.rand_name("ss-user"),
             "password": data_utils.rand_name("ss-password"),
         }
+        if set_ou:
+            data["ou"] = data_utils.rand_name("ss-ou")
+
         return data
 
     # Useful assertions