periodic(8): Adjust the bsdstats script to use drill(1) instead of dig(1).

periodic(8): Adjust the bsdstats script to use drill(1) instead of dig(1).

The check_dns() check is still wrong which is due to the setting of
IFS but until scrappy@ reports back, I won't touch that. For the
moment, it will succeed, but would also not fail in check_dns() if
the network was down.

Reported-by:   Tim Darby <t+dfbsd@timdarby.net>
Dragonfly-bug: <http://bugs.dragonflybsd.org/issue1927>