wpa_supplicant seems to somehow be auto started at boot.
# ps auxwww |grep wpa root 915 0.0 0.0 28824 1232 ? S 17:36 0:00 /sbin/wpa_supplicant -u -s
How do I disable this service, prevent it from auto starting ?
Should be enough to remove the file
Move it somewhere so you can restore it, rather than immediately delete it. ;-)