Add glide.yaml and vendor deps

vendor/github.com/docker/distribution/contrib/token-server/errors.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/docker/distribution/registry/api/errcode"
+)
+
+var (
+	errGroup = "tokenserver"
+
+	// ErrorBadTokenOption is returned when a token parameter is invalid
+	ErrorBadTokenOption = errcode.Register(errGroup, errcode.ErrorDescriptor{
+		Value:   "BAD_TOKEN_OPTION",
+		Message: "bad token option",
+		Description: `This error may be returned when a request for a
+		token contains an option which is not valid`,
+		HTTPStatusCode: http.StatusBadRequest,
+	})
+
+	// ErrorMissingRequiredField is returned when a required form field is missing
+	ErrorMissingRequiredField = errcode.Register(errGroup, errcode.ErrorDescriptor{
+		Value:   "MISSING_REQUIRED_FIELD",
+		Message: "missing required field",
+		Description: `This error may be returned when a request for a
+		token does not contain a required form field`,
+		HTTPStatusCode: http.StatusBadRequest,
+	})
+
+	// ErrorUnsupportedValue is returned when a form field has an unsupported value
+	ErrorUnsupportedValue = errcode.Register(errGroup, errcode.ErrorDescriptor{
+		Value:   "UNSUPPORTED_VALUE",
+		Message: "unsupported value",
+		Description: `This error may be returned when a request for a
+		token contains a form field with an unsupported value`,
+		HTTPStatusCode: http.StatusBadRequest,
+	})
+)