CVE-2019-10224: stretch/jessie not affected, affects python-lib389

This information disclosure vulnerability affects lib389, the Python
389DS module. This code was introduced in the 389-ds-base source in
buster.

This code is completely absent from jessie.

This code is absent from the 389-ds-base source in stretch.

However, this code is present in stretch in a different source
package: python-lib389. This package _is_ affected.