All (non etcd) tests are now local (#105)

We don't need to network to do tests, we up enough local servers
to we don't need to forward to,s say 8.8.8.8

middleware/test/zone.go

@@ -0,0 +1,21 @@
+package test
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+// Zone will create a temporary file on disk and returns the name and
+// cleanup function to remove it later.
+func Zone(t *testing.T, dir, zonefile string) (string, func(), error) {
+	f, err := ioutil.TempFile(dir, "go-test-zone")
+	if err != nil {
+		return "", nil, err
+	}
+	if err := ioutil.WriteFile(f.Name(), []byte(zonefile), 0644); err != nil {
+		return "", nil, err
+	}
+	rmFunc := func() { os.Remove(f.Name()) }
+	return f.Name(), rmFunc, nil
+}