bsdinstall: Also copy /var/db/zoneinfo

Per tzsetup(8), /etc/localtime and /var/db/zoneinfo go hand in hand.

Reviewed by:	imp@
Pull Request:	https://github.com/freebsd/freebsd-src/pull/486

usr.sbin/bsdinstall/scripts/jail

@@ -137,6 +137,7 @@ trap error SIGINT	# SIGINT is bad again
 bsdinstall config  || error "Failed to save config"
 cp /etc/resolv.conf $1/etc
 cp /etc/localtime $1/etc
+cp /var/db/zoneinfo $1/var/db
 
 # Run post-install script
 if [ -f $TMPDIR/bsdinstall-installscript-ab ]; then