update vendoring dependencies

vendor/github.com/docker/distribution/registry/api/errcode/errors.go

@@ -25,7 +25,8 @@ func (ec ErrorCode) ErrorCode() ErrorCode {
 
 // Error returns the ID/Value
 func (ec ErrorCode) Error() string {
-	return ec.Descriptor().Value
+	// NOTE(stevvooe): Cannot use message here since it may have unpopulated args.
+	return strings.ToLower(strings.Replace(ec.String(), "_", " ", -1))
 }
 
 // Descriptor returns the descriptor for the error code.
@@ -68,6 +69,15 @@ func (ec *ErrorCode) UnmarshalText(text []byte) error {
 	return nil
 }
 
+// WithMessage creates a new Error struct based on the passed-in info and
+// overrides the Message property.
+func (ec ErrorCode) WithMessage(message string) Error {
+	return Error{
+		Code:    ec,
+		Message: message,
+	}
+}
+
 // WithDetail creates a new Error struct based on the passed-in info and
 // set the Detail property appropriately
 func (ec ErrorCode) WithDetail(detail interface{}) Error {
@@ -104,9 +114,7 @@ func (e Error) ErrorCode() ErrorCode {
 
 // Error returns a human readable representation of the error.
 func (e Error) Error() string {
-	return fmt.Sprintf("%s: %s",
-		strings.ToLower(strings.Replace(e.Code.String(), "_", " ", -1)),
-		e.Message)
+	return fmt.Sprintf("%s: %s", e.Code.Error(), e.Message)
 }
 
 // WithDetail will return a new Error, based on the current one, but with

vendor/github.com/docker/distribution/registry/api/errcode/register.go

@@ -55,7 +55,7 @@ var (
 		HTTPStatusCode: http.StatusForbidden,
 	})
 
-	// ErrorCodeUnavailable provides a common error to report unavialability
+	// ErrorCodeUnavailable provides a common error to report unavailability
 	// of a service or endpoint.
 	ErrorCodeUnavailable = Register("errcode", ErrorDescriptor{
 		Value:          "UNAVAILABLE",
@@ -63,6 +63,16 @@ var (
 		Description:    "Returned when a service is not available",
 		HTTPStatusCode: http.StatusServiceUnavailable,
 	})
+
+	// ErrorCodeTooManyRequests is returned if a client attempts too many
+	// times to contact a service endpoint.
+	ErrorCodeTooManyRequests = Register("errcode", ErrorDescriptor{
+		Value:   "TOOMANYREQUESTS",
+		Message: "too many requests",
+		Description: `Returned when a client attempts to contact a
+		service too many times`,
+		HTTPStatusCode: http.StatusTooManyRequests,
+	})
 )
 
 var nextCode = 1000