Update go dependencies

vendor/github.com/gophercloud/gophercloud/errors.go

@@ -1,6 +1,9 @@
 package gophercloud
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 // BaseError is an error type that all other error types embed.
 type BaseError struct {
@@ -43,6 +46,33 @@ func (e ErrInvalidInput) Error() string {
 	return e.choseErrString()
 }
 
+// ErrMissingEnvironmentVariable is the error when environment variable is required
+// in a particular situation but not provided by the user
+type ErrMissingEnvironmentVariable struct {
+	BaseError
+	EnvironmentVariable string
+}
+
+func (e ErrMissingEnvironmentVariable) Error() string {
+	e.DefaultErrString = fmt.Sprintf("Missing environment variable [%s]", e.EnvironmentVariable)
+	return e.choseErrString()
+}
+
+// ErrMissingAnyoneOfEnvironmentVariables is the error when anyone of the environment variables
+// is required in a particular situation but not provided by the user
+type ErrMissingAnyoneOfEnvironmentVariables struct {
+	BaseError
+	EnvironmentVariables []string
+}
+
+func (e ErrMissingAnyoneOfEnvironmentVariables) Error() string {
+	e.DefaultErrString = fmt.Sprintf(
+		"Missing one of the following environment variables [%s]",
+		strings.Join(e.EnvironmentVariables, ", "),
+	)
+	return e.choseErrString()
+}
+
 // ErrUnexpectedResponseCode is returned by the Request method when a response code other than
 // those listed in OkCodes is encountered.
 type ErrUnexpectedResponseCode struct {
@@ -72,6 +102,11 @@ type ErrDefault401 struct {
 	ErrUnexpectedResponseCode
 }
 
+// ErrDefault403 is the default error type returned on a 403 HTTP response code.
+type ErrDefault403 struct {
+	ErrUnexpectedResponseCode
+}
+
 // ErrDefault404 is the default error type returned on a 404 HTTP response code.
 type ErrDefault404 struct {
 	ErrUnexpectedResponseCode
@@ -108,6 +143,13 @@ func (e ErrDefault400) Error() string {
 func (e ErrDefault401) Error() string {
 	return "Authentication failed"
 }
+func (e ErrDefault403) Error() string {
+	e.DefaultErrString = fmt.Sprintf(
+		"Request forbidden: [%s %s], error message: %s",
+		e.Method, e.URL, e.Body,
+	)
+	return e.choseErrString()
+}
 func (e ErrDefault404) Error() string {
 	return "Resource not found"
 }
@@ -141,6 +183,12 @@ type Err401er interface {
 	Error401(ErrUnexpectedResponseCode) error
 }
 
+// Err403er is the interface resource error types implement to override the error message
+// from a 403 error.
+type Err403er interface {
+	Error403(ErrUnexpectedResponseCode) error
+}
+
 // Err404er is the interface resource error types implement to override the error message
 // from a 404 error.
 type Err404er interface {