kubernetes: fix conntrack-tools package name, missing dir, and tests

(cherry picked from commit ab1567e8121dfcdb4f7a395b39a3a345f41c7474)

nixos/tests/kubernetes/base.nix

@@ -40,7 +40,7 @@ let
                   allowedTCPPorts = [
                     10250 # kubelet
                   ];
-                  trustedInterfaces = ["docker0"];
+                  trustedInterfaces = ["mynet"];
 
                   extraCommands = concatMapStrings  (node: ''
                     iptables -A INPUT -s ${node.config.networking.primaryIPAddress} -j ACCEPT
@@ -61,6 +61,13 @@ let
                   advertiseAddress = master.ip;
                 };
                 masterAddress = "${masterName}.${config.networking.domain}";
+                # workaround for:
+                #   https://github.com/kubernetes/kubernetes/issues/102676
+                #   (workaround from) https://github.com/kubernetes/kubernetes/issues/95488
+                kubelet.extraOpts = ''\
+                  --cgroups-per-qos=false \
+                  --enforce-node-allocatable="" \
+                '';
               };
             }
             (optionalAttrs (any (role: role == "master") machine.roles) {