* 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.
check_certs task "Check_certs | Set 'sync_certs' to true" was failing
due to the dict not existing, this sets defaults that allows the
correct behavior of the conditionals.