Member addition without auto-stacking

A member can be added to the stack to augment an existing stack. The member being added can be a factory-default switch or a switch with pre-existing configuration.

1. Configure interfaces to VSF links on the member being added.
2. Renumber the member being added.

   The member will not join the stack if there is a member number conflict.

3. Renumbering will cause a reboot of the switch.
4. Connect the configured VSF links to a previously configured VSF link on the stack.
5. The member joins the stack, with default configuration on its interfaces. Any previous configuration on the member will be lost.