ipaservice: Enable batch command use with keeponly

The use of the batch command is enabled for execute_ipa_commands.

Additionally keeponly is set to [] as nothing is used from the data returned
from the commands.

plugins/modules/ipaservice.py

@@ -931,7 +931,7 @@ def main():
 
         # Execute commands
         changed = ansible_module.execute_ipa_commands(
-            commands, fail_on_member_errors=True)
+            commands, batch=True, keeponly=[], fail_on_member_errors=True)
 
     # Done
     ansible_module.exit_json(changed=changed, **exit_args)