Remove dummy region from providers

terraform validate wants this, but adding any key inside the provider
block other than "alias" appears to actually _define_ a provider
instead of allowing one to be passed in from the parent module.

In this case, a provider is created from the default profile and the
specified region, and this is used _instead_ of the aws.images-staging
and aws.images-production providers passed in by the parent module.

Author: jsf9k

providers.tf

@@ -1,26 +1,16 @@
-# Default AWS region to use for the AWS providers.
-# This is needed to supply `terraform validate` with all of the required
-# parameters it needs to check the code.
-locals {
-  aws_region = "us-east-1"
-}
-
 # This is the default provider that is used to create resources inside
 # the Users account
 provider "aws" {
-  region = local.aws_region
 }
 
 # This is the provider that is used to create the role and policy that can
 # read Parameter Store parameters inside the Images Production account
 provider "aws" {
-  region = local.aws_region
-  alias  = "images-production"
+  alias = "images-production"
 }
 
 # This is the provider that is used to create the role and policy that can
 # read Parameter Store parameters inside the Images Staging account
 provider "aws" {
-  region = local.aws_region
-  alias  = "images-staging"
+  alias = "images-staging"
 }