* acquire DHCP on the interfaces with networking.interface.$name.useDHCP == true or on all interfaces if networking.useDHCP == true (was only only "eth0")
* respect "mtu" if it was in DHCP answer (it happens in the wild)
* acquire and set up staticroutes (unlike others clients, udhcpc does not do the query by default); this supersedes https://github.com/NixOS/nixpkgs/pull/41829
This can be used to fix issues where udhcpc times out before
acquiring a lease. For example of these issues, see:
https://bugs.alpinelinux.org/issues/3105#note-8
Signed-off-by: Dino A. Dai Zovi <ddz@theta44.org>
