The OpenBSD Host code used FreeBSD-style sysctl MIBs, which don't
match OpenBSD's interface, so process lookups failed.
- GetOpenBSDProcessArgs: use {CTL_KERN, KERN_PROC_ARGS, pid,
KERN_PROC_ARGV}. OpenBSD returns a NULL-terminated argv array
whose pointers point into the returned buffer, so iterate it
directly.
- GetOpenBSDProcessUserAndGroup, FindProcessesImpl: KERN_PROC
takes a 6-element MIB on OpenBSD, with the kinfo_proc element
size and element count as the last two entries.
(cherry picked from commit b880f44cbad751b0784a5fbbfbdaacea25e167f8)