Allow Calico networking on Azure and DigitalOcean

* Introduce "calico" as a `networking` option on Azure and DigitalOcean
using Calico's new VXLAN support (similar to flannel). Flannel remains
the default on these platforms for now.
* Historically, DigitalOcean and Azure only allowed Flannel as the
CNI provider, since those platforms don't support IPIP traffic that
was previously required for Calico.
* Looking forward, its desireable for Calico to become the default
across Typhoon clusters, since it provides NetworkPolicy and a
consistent experience
* No changes to AWS, GCP, or bare-metal where Calico remains the
default CNI provider. On these platforms, IPIP mode will always
be used, since its available and more performant than vxlan

digital-ocean/container-linux/kubernetes/ssh.tf

@@ -1,6 +1,7 @@
 # Secure copy etcd TLS assets and kubeconfig to controllers. Activates kubelet.service
 resource "null_resource" "copy-controller-secrets" {
   count = "${var.controller_count}"
+
   depends_on = [
     "digitalocean_firewall.rules",
   ]