Turn networking.interfaces into an attribute set

Thus

  networking.interfaces = [ { name = "eth0"; ipAddress = "192.168.15.1"; } ];

can now be written as

  networking.interfaces.eth0.ipAddress = "192.168.15.1";

The old notation still works though.

modules/virtualisation/ec2-data.nix

@@ -13,7 +13,7 @@ with pkgs.lib;
 
       wantedBy = [ "multi-user.target" ];
       before = [ "sshd.service" ];
-      after = [ "dhcpcd.service" ];
+      after = [ "network.target" ];
 
       path = [ pkgs.curl pkgs.iproute ];