This allows you to use the `certs` and `num_certs` writeout variables in
the curl tool, and getting information about the server certificates
using CURLINFO_CERTINFO.
Closes#16459
- Install stunnel.
- Regenerate certificates (as SecureTransport requires a validity period
less than 398 days).
- Restart server if it is unresponsive.
- Do not hardcode the SHA-256 base64 public pinned key.
- Ignore test 313 as SecureTransport does not support crl file.
- Ignore tests 1631 and 1632 as SecureTransport is not yet able to shut
down FTP over HTTPS gracefully.
- Add a CMake target for generating certificates.
Closes#14486