GitLab

Result was that PEM errors in files with multiple certificates were not
detectable by the user.

The meaning of debug_level was shift by one during the last debug overhaul.
(The new one is more rational, previously debug_level=1 didn't do anything.)

No numbering: does not add value, and painful to maintain, esp. with branches

Goal is to test renegotiation better: we need more than one exchange for
server-initiated renego to work reliably (the previous hack for this wouldn't
work with non-blocking I/O and probably not with DTLS either).

Also check message termination in a semi-realistic way.

Will be useful for:
- detecting termination of messages by other means than connection close
- DTLS (can be seen as a special case of the above: datagram-oriented)

Currently unbounded: will be fixed later