add a rescue/sh sanity check before installworld on the running system

add a rescue/sh sanity check before installworld on the running system

FreeBSD does not guarantee kernel forward compatibility (that is,
running a newer userland on an older kernel).  The documented upgrade
procedure specifies that installkernel should be performed, followed by
a reboot and then installworld.  As a sanity check when installing onto
the running system (DESTDIR is / or unset), attempt to run "sh echo OK"
using rescue from the objdir.  If rescue fails (e.g., because the system
has not been rebooted and the "old" kernel lacks a system call required
by the to-be-installed world), abort the installation.

This should avoid ino64 foot-shooting when the proper upgrade procedure
is not followed.

Reviewed by:	allanjude, gjb, kib
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D10987