Fix Calico Felix reporting usage data, require opt-in

* Calico Felix has been reporting anonymous usage data about the
version and cluster size, which violates Typhoon's privacy policy
where analytics should be opt-in only
* Add a variable enable_reporting (default: false) to allow opting
in to reporting usage data to Calico (or future components)

aws/container-linux/kubernetes/variables.tf

@@ -134,3 +134,9 @@ variable "cluster_domain_suffix" {
   type        = "string"
   default     = "cluster.local"
 }
+
+variable "enable_reporting" {
+  type        = "string"
+  description = "Enable usage or analytics reporting to upstreams (Calico)"
+  default     = "false"
+}