it fails bandly at runtime on various linux distros and on freebsd. Until a fix is found, disable it so I can move forward.

Incorporate the OpenSMTPD' privsep crypto engine. The idea behind it is to never load the certificate' private keys in a networked process, instead they are loaded in a separate process (the `crypto' one) which signs payloads on the behalf of the server processes. This way, we greatly reduce the risk of leaking the certificate' private key should the server process be compromised. This currently compiles only on LibreSSL (portable fix is in the way).

this avoids having the daemon dieing on SIGHUP with a bad config file.

while here also make them a list rather than a fixed-size array.

Was temporarly disabled during the transition to real privsep. While here, fix a memory leak when using `require client ca'. Also, avoid leaking info about the parent address space layout to server processes by not sending pointer values.

set them as global vars; rename foreground -> debug

server_configure_done is the code we ran in IMSG_RECONF_END splitted in a separate functions. This is all needed for ge.c which doesn't do privsep but needs to bootstrap the server process.

so that ge can provide its own log_request without requiring a separate logger process.