boot console tty, so that the console is on the same place that the kernel
dmesg output goes, whether wscons or serial. Users who want to use tty00
or ttyE0 explicitly can change /etc/ttys themselves.
Also use "vt100" as terminal type for /dev/console (for a reasonable baseline
that also works with wscons; pccons is long since no longer default).
This addresses PR install/13249, i386-specific, but may be appropriate to
apply to all ports.
tv