* Consolidate variable definitions to `kargo-defaults`.
* Set `AlwaysAllow` as the default authorization mode.
* Ability to set multiple authorization modes.
* Various style fixes and typos
* Add a flag "authorization_method", when set to "RBAC" enables role based access control.
* Add required cluster roles and bindings for kube-dns
* Patch tiller deployment to use a service account with proper credentials.
* Add a flag to regenerate kubernetes certs on the nodes.
Migrate older inline= syntax to pure yml syntax for module args as to be consistant with most of the rest of the tasks
Cleanup some spacing in various files
Rename some files named yaml to yml for consistancy
