Pull up following revision(s) (requested by snj in ticket #743):

usr.sbin/sysinst/arch/i386/md.c: revision 1.7

Clear the screen after running installboot.  If we don't, there will
be a leftover line saying "Status: Finished" at the top of the next
screen, along with some random punctuation in the left and right
margins.  Inspired by ../landisk/md.c 1.3.

(martin)