pylint: Skip isinstance-second-argument-not-valid-type
The type of value to be compared is class attribute.
Today's Pylint doesn't support this.
Fixes: https://pagure.io/freeipa/issue/9117
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>