1e0975f4c0
When doing source routing/multihoming, it's practical to give names to routing tables. The absence of the rt_table file in /etc make this impossible. This patch recreates these files on rebuild so that they can be modified by the user see NixOS#38638. iproute2 is modified to look into config.networking.iproute2.confDir instead of /etc/iproute2.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.