OS: R68

Shill doesn't record or log what regulatory domain we are in. 
We'll need stats from the field for geoSAR etc. 

(in shill directory). 
$ git grep regulatory
bin/set_wifi_regulatory:# UDEV event helper script that sets the system's WiFi regulatory domain
bin/test_set_wifi_regulatory:# UDEV event helper script that sets the system's WiFi regulatory domain
bin/test_set_wifi_regulatory:  . $(dirname $0)/set_wifi_regulatory
bin/test_set_wifi_regulatory:# Fake out the commands that are called by set_wifi_regulatory.
net/netlink_manager.cc:const char NetlinkManager::kEventTypeRegulatory[] = "regulatory";
udev/87-set_wifi_regulatory.rules:# Configure initial regulatory domain from VPD, for devices that don't
udev/87-set_wifi_regulatory.rules:SUBSYSTEM=="net", ACTION=="add", DRIVERS=="brcmfmac*", RUN+="/usr/sbin/set_wifi_regulatory"