fix(ctr): enable networking for Windows containers

Signed-off-by: Markus Lippert <lippertmarkus@gmx.de>

cmd/ctr/commands/run/run_unix.go

@@ -79,10 +79,6 @@ var platformRunFlags = []cli.Flag{
 		Usage: "set the cpu shares",
 		Value: 1024,
 	},
-	cli.BoolFlag{
-		Name:  "cni",
-		Usage: "enable cni networking for the container",
-	},
 }
 
 // NewContainer creates a new container
@@ -449,3 +445,7 @@ func validNamespace(ns string) bool {
 		return false
 	}
 }
+
+func getNetNSPath(_ gocontext.Context, task containerd.Task) (string, error) {
+	return fmt.Sprintf("/proc/%d/ns/net", task.Pid()), nil
+}