Enable using ssh config file (needed for ProxyCommand)
Remove Berkshelf, add some other stuff

* Berkshelf was providing few benefits over the (now tagged)
  github repositories, so we're just going to keep it simple.
* Remove chef-client and bootstrap-version from spiceweasel
* Convert more constants to task arguments
* Implement timeout for Chef key regeneration command
New ansible stuff
Copy/paste fail
Reduce git depth and use ssh-keyscan