Set usePredictableinterfacenames

We do this to allow eth0 to be set up for dhcp automagically. Linode
recommends this, and it makes our configuration simpler.

etc/nixos/configuration.nix

@@ -20,6 +20,7 @@
   networking = {
     hostName = "tlaternet";
 
+    usePredictableInterfaceNames = false;
     # useDHCP is deprecated
     useDHCP = false;
     interfaces.eth0.useDHCP = true;