vendor contianers/image with docker/docker/reference forked

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

vendor/github.com/docker/distribution/reference/reference.go

@@ -24,7 +24,6 @@ package reference
 import (
 	"errors"
 	"fmt"
-	"strings"
 
 	"github.com/docker/distribution/digest"
 )
@@ -44,9 +43,6 @@ var (
 	// ErrDigestInvalidFormat represents an error while trying to parse a string as a tag.
 	ErrDigestInvalidFormat = errors.New("invalid digest format")
 
-	// ErrNameContainsUppercase is returned for invalid repository names that contain uppercase characters.
-	ErrNameContainsUppercase = errors.New("repository name must be lowercase")
-
 	// ErrNameEmpty is returned for empty, invalid repository names.
 	ErrNameEmpty = errors.New("repository name must have at least one component")
 
@@ -153,9 +149,7 @@ func Parse(s string) (Reference, error) {
 		if s == "" {
 			return nil, ErrNameEmpty
 		}
-		if ReferenceRegexp.FindStringSubmatch(strings.ToLower(s)) != nil {
-			return nil, ErrNameContainsUppercase
-		}
+		// TODO(dmcgowan): Provide more specific and helpful error
 		return nil, ErrReferenceInvalidFormat
 	}