top-level initialize.tf, symlinked into environments

initialize.tf

## declare all the env-specific variables that are defined in *.tfvars

variable "env" { } 
variable "name" { } 
variable "size" { } 

variable "cidr" { } 
variable "instance_type" { } 
variable "kafka_instance_type" { } 
variable "retriever_instance_type" { } 

variable "public_ranges" { } 
variable "private_ranges" { } 

variable "subdomain_int_name" { } 
variable "subdomain_ext_name" { }