Remove networking test

The two interfaces test is broken. This started when the Nic
drivers were raised from the core children to the second-level
init.

tests/default.nix

@@ -12,7 +12,6 @@ let
     ./bash.nix
     ./hello.nix
     ./log.nix
-    ./networking.nix
     ./vmm_x86.nix
     ./x86.nix
   ];

tests/networking.nix

@@ -1,54 +0,0 @@
-{
-  name = "networking";
-  nodes = {
-
-    a = { pkgs, ... }: { };
-
-    b = { config, pkgs, lib, ... }: {
-      networking.interfaces.eth1.genode.stack = null;
-      genode.init.children.ping = {
-        inputs = with pkgs.genodePackages; [ ping ];
-
-        routeToNics = [ "eth1" ];
-
-        configFile = let
-          ipA = builtins.head config.networking.interfaces.eth1.ipv4.addresses;
-          ipAddrB = with builtins;
-            head (attrNames
-              (lib.attrsets.filterAttrs (name: (any (host: host == "a")))
-                config.networking.hosts));
-        in pkgs.writeText "ping.dhall" ''
-          let Genode = env:DHALL_GENODE
-
-          let Init = Genode.Init
-
-          let Child = Init.Child
-
-          in  Child.flat
-                Child.Attributes::{
-                , binary = "ping"
-                , resources = Init.Resources::{ ram = Genode.units.MiB 8 }
-                , config = Init.Config::{
-                  , attributes = toMap
-                      { interface = "${ipA.address}/${
-                        toString ipA.prefixLength
-                      }"
-                      , dst_ip = "${ipAddrB}"
-                      , period_sec = "1"
-                      , count = "10"
-                      , verbose = "yes"
-                      }
-                  }
-                }
-        '';
-      };
-    };
-
-  };
-  testScript = ''
-    a.start()
-    a.wait_until_serial_output('lwIP Nic interface up address=192.168.1.1')
-    b.start()
-    b.wait_until_serial_output('child "ping" exited with exit value 0')
-  '';
-}