Support bucket versioning (#9377)

- Implement a new xl.json 2.0.0 format to support,
  this moves the entire marshaling logic to POSIX
  layer, top layer always consumes a common FileInfo
  construct which simplifies the metadata reads.
- Implement list object versions
- Migrate to siphash from crchash for new deployments
  for object placements.

Fixes #2111

cmd/gateway-common.go

@@ -55,42 +55,6 @@ var (
 	IsStringEqual = isStringEqual
 )
 
-// StatInfo -  alias for statInfo
-type StatInfo struct {
-	statInfo
-}
-
-// AnonErrToObjectErr - converts standard http codes into meaningful object layer errors.
-func AnonErrToObjectErr(statusCode int, params ...string) error {
-	bucket := ""
-	object := ""
-	if len(params) >= 1 {
-		bucket = params[0]
-	}
-	if len(params) == 2 {
-		object = params[1]
-	}
-
-	switch statusCode {
-	case http.StatusNotFound:
-		if object != "" {
-			return ObjectNotFound{bucket, object}
-		}
-		return BucketNotFound{Bucket: bucket}
-	case http.StatusBadRequest:
-		if object != "" {
-			return ObjectNameInvalid{bucket, object}
-		}
-		return BucketNameInvalid{Bucket: bucket}
-	case http.StatusForbidden:
-		fallthrough
-	case http.StatusUnauthorized:
-		return AllAccessDisabled{bucket, object}
-	}
-
-	return errUnexpected
-}
-
 // FromMinioClientMetadata converts minio metadata to map[string]string
 func FromMinioClientMetadata(metadata map[string][]string) map[string]string {
 	mm := map[string]string{}