Update terraform files and instructions (#1402)

* Update terraform files and instructions

Update proxy terraform files based on current best practices and allow
exclusion of forwarding rules for HTTP endpoints.  Specifically:
-   Add a "public_web_whois" input to allow disabling the public HTTP
    whois forwarding.
-   Add "description" fields to all variables.
-   Move outputs of the top-level module into "outputs.tf".
-   Auto-reformat using hclfmt.

proxy/terraform/modules/networking/variables.tf

@@ -1,20 +1,32 @@
-# Instance groups that the load balancer forwards traffic to.
 variable "proxy_instance_groups" {
-  type = map
+  type        = map
+  description = "Instance groups that the load balancer forwards traffic to."
 }
 
-# Suffix (such as "-canary") added to the resource names.
 variable "suffix" {
-  default = ""
+  default     = ""
+  description = "Suffix (such as '-canary') added to the resource names."
 }
 
-# Node ports exposed by the proxy.
 variable "proxy_ports" {
-  type = map
+  type        = map
+  description = "Node ports exposed by the proxy."
 }
 
-# DNS zone for the proxy domain.
-variable "proxy_domain" {}
+variable "proxy_domain" {
+  description = "DNS zone for the proxy domain."
+}
 
-# domain name of the zone.
-variable "proxy_domain_name" {}
+variable "proxy_domain_name" {
+  description = "Domain name of the zone."
+}
+
+variable "public_web_whois" {
+  type        = number
+  description = <<EOF
+    Set to 1 if the whois HTTP ports are external, 0 if not.  This is necessary
+    because our test projects are configured with
+    constraints/compute.restrictLoadBalancerCreationForTypes, which prohibits
+    forwarding external HTTP(s) connections.
+    EOF
+}