For the most part, there are no breaking changes.

However, the expired certificate is now showing "expired certificate"
although previously it showed a simpler "bad certificate" which was
hard-coded into the TLS settings test scenario.

Instead of two `expired certificate` and `bad certificate` comparisons, we can just check for `certificate` in error output. This satisfies us when checking there is something wrong with the certificate.

Co-authored-by: Scott Blum <dragonsinth@gmail.com>