Fixes #2434 by adding OpenStack Glance metadata support

builder/openstack/image_config.go

@@ -9,6 +9,7 @@ import (
 // ImageConfig is for common configuration related to creating Images.
 type ImageConfig struct {
 	ImageName     string            `mapstructure:"image_name"`
+	ImageMetadata map[string]string `mapstructure:"metadata"`
 }
 
 func (c *ImageConfig) Prepare(ctx *interpolate.Context) []error {

builder/openstack/step_create_image.go

@@ -31,6 +31,7 @@ func (s *stepCreateImage) Run(state multistep.StateBag) multistep.StepAction {
 	ui.Say(fmt.Sprintf("Creating the image: %s", config.ImageName))
 	imageId, err := servers.CreateImage(client, server.ID, servers.CreateImageOpts{
 		Name:     config.ImageName,
+		Metadata: config.ImageMetadata,
 	}).ExtractImageID()
 	if err != nil {
 		err := fmt.Errorf("Error creating image: %s", err)

website/source/docs/builders/openstack.html.markdown

@@ -96,6 +96,8 @@ can be configured for this builder.
 * `rackconnect_wait` (boolean) - For rackspace, whether or not to wait for
   Rackconnect to assign the machine an IP address before connecting via SSH.
   Defaults to false.
+* `metadata` (object of key/value strings) - Glance metadata that will be applied
+  to the image.
 
 ## Basic Example: Rackspace public cloud