ui_tests: extend test_user suite
Extend WebUI test_user suite with the following test cases:
test_add_user_special
test_user_misc
test_ssh_keys
test_add_delete_undo_reset
test_disable_delete_admin
test_login_without_username
https://pagure.io/freeipa/issue/7507
Reviewed-By: Petr Vobornik <pvoborni@redhat.com>