Use Chef 11 on the controller node

This patch removes the Chef10 server VM, and install CHEF11 directly on
the controller node.

RabbitMQ is installed before chef, and chef is configured to use the
existing RabbitMQ installation. Cookbooks need to be updated to also
use this rabbit instance for openstack.

Other changes:
  * update cookbook/ISO paths
  * embed chef-server.deb
  * add amqp test script to ensure chef account is created successfully
  * Added key distribution service (xinetd, port 7777) to enable clients
        to retrieve the validation key.