Migrate to external Donut package

pkg/storage/donut/bucket.go

@@ -1,42 +0,0 @@
-package donut
-
-import (
-	"errors"
-	"strconv"
-	"strings"
-
-	"github.com/minio-io/iodine"
-)
-
-type donutBucket struct {
-	nodes   []string
-	objects map[string][]byte
-}
-
-// GetNodes - get list of associated nodes for a given bucket
-func (b donutBucket) GetNodes() ([]string, error) {
-	var nodes []string
-	for _, node := range b.nodes {
-		nodes = append(nodes, node)
-	}
-	return nodes, nil
-}
-
-// AddNode - adds a node to a bucket
-func (b donutBucket) AddNode(nodeID, bucketID string) error {
-	errParams := map[string]string{"node": nodeID, "bucketID": bucketID}
-	tokens := strings.Split(bucketID, ":")
-	if len(tokens) != 3 {
-		return iodine.New(errors.New("Bucket ID malformeD: "+bucketID), errParams)
-
-	}
-	// bucketName := tokens[0]
-	// aggregate := tokens[1]
-	// aggregate := "0"
-	part, err := strconv.Atoi(tokens[2])
-	if err != nil {
-		return iodine.New(errors.New("Part malformed: "+tokens[2]), errParams)
-	}
-	b.nodes[part] = nodeID
-	return nil
-}