* Shift athctrl to /usr/local, and lose the ".sh" prefix as the
common practice is to not use a suffix for those utilities. Also
sync the file with src.git/tools/tools/ath/athctrl.sh, even
though the changes are only cosmetic.
* /sbin/dhclient-script already exists and was overwritten. Worse
still, /usr/local/sbin/dhclient-script also exists. To "clean"
this up, rename the modified file to dhclient-script.ext. Our
management system picks up the correct file anyway.
