soon we'll be using a struct ibuf and it'll be confusing.

Makes parsing and handling of imsgs simpler / clearer. only crypto.c is left as-is.

since proc_forward_imsg() never forwards a file descriptor (it's never called actually) just use -1 there.

Install a sample config, include a self-signed cert and setup a local user and chroot.

printed the wrong value for the hostname

so that we don't have to hardcode /etc in gmid.c. Helps on systems like FreeBSD where the non-base programs are expected to look for their config in /usr/local/etc.