Initial Work on getting auto-population of settings if databags are not present

If using a chef-solo provisioner, you will need to add chef-solo-search to your Berksfile, and your run list for this to work. This however will work regardless on chef-client, since search is built in. Also, this approach adds default attributes for the db_user, db_password, admin_user and admin_pass, this means it can be overridden in the json or through a databag.

A pull request will be coming to drupal-lamp for this shortly to add them, since it is a chef-solo provisioner