New donut driver with local file encoding

pkg/storage/donut/bucketdriver.go

@@ -0,0 +1,14 @@
+package donut
+
+type bucketDriver struct {
+	nodes   []string
+	objects map[string][]byte
+}
+
+func (self bucketDriver) GetNodes() ([]string, error) {
+	var nodes []string
+	for _, node := range self.nodes {
+		nodes = append(nodes, node)
+	}
+	return nodes, nil
+}