tests: add xmlrpc test for ipa user-add --radius-username
Add a xmlrpc test for ipa user-add/user-mod --radius-username
The command were previously failing because the objectclass
ipatokenradiusproxyuser was not automatically added when the
attribute ipatokenRadiusUserName was added to the entry.
The test ensures that the command is now succeeding.
Related to https://pagure.io/freeipa/issue/7569
Reviewed-By: Alexander Bokovoy <email@example.com>
Reviewed-By: Christian Heimes <firstname.lastname@example.org>