Respect new HAVE_CHEF_WEBUI option from crowbar

Do not add a link to the chef webui for that node if there's no webui.
Merge pull request #174 from vuntz/no-chef-link

Respect new HAVE_CHEF_WEBUI option from crowbar
fix typos
coding style: spaces around =
add support for autoyast installation using external SMT server
add support for ssh access during autoyast
fix indentation