plugins: Don't treat keys of api as bytes

The plugin `plugins` iterates over the keys of API instance,
__iter__ of which is a generator of class.__name__ from
(Command, Object, Method, Backend, Updater). So, the allowed type
is str, not bytes.

Fixes: https://pagure.io/freeipa/issue/8898
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>

ipalib/misc.py

@@ -124,7 +124,7 @@ class plugins(LocalOrRemote):
             for plugin in self.api[namespace]():
                 cls = type(plugin)
                 key = '{}.{}'.format(cls.__module__, cls.__name__)
-                result.setdefault(key, []).append(namespace.decode('utf-8'))
+                result.setdefault(key, []).append(namespace)
 
         return dict(
             result=result,