implement a real network_id function with ugly usage of echo and md5sum syscalls
start numbering wifi-ifaces from 0 instead of 1, so mesh0 = radio0, etc
add an AP wifi-iface to each radio, for roaming client access
netifd was bizarrely failing with long interface identifiers; shorten prefix lime_ -> lm_
hacky hacky way of setting up a macvlan over br-lan, until proper netifd support is completed by jow
autoassign batadv vlan according to first byte of network_id