[vcloud_director] Show guest customization "admin password auto"

Guest customization setting "admin password auto" was retrieved but not
shown.
[vcloud_director] Handle Guest admin password

Admin passwords can be retrieved and modified using the VMWare console,
so it's useful to allow the same operations here.

Moreover, when an admin password is enabled and "admin password auto" is
false, it's impossible to modify Guest settings.
i.e., "The administrator password cannot be empty when it is enabled and
automatic password generation is not selected."

This patch also fixes `put_guest_customization_section_vapp` where an
AdminPassword element was never created.
Merge pull request #2464 from astratto/guest_password

[vcloud_director] Fix Guest admin password settings