pylint: Fix consider-using-dict-items
    
    Pylint 2.9 introduced new check:
    > New checker consider-using-dict-items. Emitted when iterating over
    dictionary keys and then indexing the same dictionary with the key
    within loop body.
    
    Fixes: https://pagure.io/freeipa/issue/9117
    Signed-off-by: Stanislav Levin <slev@altlinux.org>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>