import pagure.lib.query before using it, in the code
    
    For a reason I do not quite understand, without this import
    statement (that is already present earlier in the code), the code
    crash with the error:
      File "/usr/lib/python3.6/site-packages/pagure/ui/clone.py", line 71, in _get_remote_user
        token = pagure.lib.query.get_api_token(
      UnboundLocalError: local variable 'pagure' referenced before assignment
    
    This solves the error, but I really don't see why it occurs in the
    first place.
    
    Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>