Fixes no_log warning for `update_password`.

This patch explicitly set `no_log` option for `update_password` attribute
to `False`, so that the warning on `no_log` not being set is not issued
anymore. Ansible incorrectly issued the warning, as `update_password` does
not carry sensitive information.

plugins/modules/ipauser.py

@@ -817,7 +817,7 @@ def main():
             preserve=dict(required=False, type='bool', default=None),
 
             # mod
-            update_password=dict(type='str', default=None,
+            update_password=dict(type='str', default=None, no_log=False,
                                  choices=['always', 'on_create']),
 
             # general