We can no longer use OCSP stapling and Must-Staple. These will soon be
obsolete once the `shortlived` profile is available for public use since
it will provide certificates with a similar lifetime as OCSP responses.
In the meantime, we've moved to the `tlsserver` profile stripping legacy
features to prepare for the `shortlived` profile which will be identical
to `tlsserver` but with a validity period of 6 days.
298c357bc9