Add --hostport to run-container.

This helps as a starting point to show a single-machine container.
Its easier to use this as an example to show where host port mapping breaks and move on to
services.

pkg/kubectl/cmd/run.go

@@ -60,6 +60,7 @@ func NewCmdRunContainer(f *cmdutil.Factory, out io.Writer) *cobra.Command {
 	cmd.Flags().Bool("dry-run", false, "If true, only print the object that would be sent, without sending it.")
 	cmd.Flags().String("overrides", "", "An inline JSON override for the generated object. If this is non-empty, it is used to override the generated object. Requires that the object supply a valid apiVersion field.")
 	cmd.Flags().Int("port", -1, "The port that this container exposes.")
+	cmd.Flags().Int("hostport", -1, "The host port mapping for the container port. To demonstrate a single-machine container.")
 	cmd.Flags().StringP("labels", "l", "", "Labels to apply to the pod(s) created by this call to run-container.")
 	return cmd
 }