Hopefully, this installs a different /etc/default/udhcpc file on
sysmocom-idu machines. Not sure if adding a machine subdir suffices.
The idea is that the machine-specific subdir symocom-idu should replace
the udhcpc.default file used for the idu packages, only, which has both
resolv.conf mods and default route disabled by default.
Neels Hofmeyr