Enable unattended installation in kiwi config

To avoid any interaction during installation.
Fix up install to bounce the webserver before creating the admin node.
Fixed the network layout on the admin to match RA.
Fix the network layout to match the RA.
Add documentation listing the openSUSE images and their differences

As tracked in Trello [1]. List of published Crowbar openSUSE builds and
their intended usage.

[1] https://trello.com/card/document-differences-between-opensuse-appliances/50809fb54fa7ad9c1a000f4d/148
Update start-vm script and associated docs