Path stuff copied over and tests added

middleware/etcd/path_test.go

@@ -0,0 +1,13 @@
+package etcd
+
+import "testing"
+
+func TestPath(t *testing.T) {
+	for path := range []string{"mydns", "skydns"} {
+		e := Etcd{PathPrefix: "mydns"}
+		result := e.Path("service.staging.skydns.local.")
+		if result != "/"+path+"/"+"/local/skydns/staging/service" {
+			t.Errorf("Failure to get domain's path with prefix: %s", path)
+		}
+	}
+}