CLEANUP: ssl/ocsp: remove the deprecated parsing code for "ocsp-update"

CLEANUP: ssl/ocsp: remove the deprecated parsing code for "ocsp-update"

Remove the "ocsp-update" keyword handling from the crt-list.

The code was made as an exception everywhere so we could activate the
ocsp-update for an individual certificate.

The feature will still exists but will be parsed as a "crt-store"
keyword which will still be usable in a "crt-list". This will appear in
future commits.

This commit also disable the reg-tests for now.