multi-az-subnets
Terraform module for multi-AZ [`subnets`](http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.html) provisioning. The module creates private and public subnets in the provided Availability Zones. The public subnets are routed to the Internet Gateway specified by `var.igw_id`. `nat_gateway_enabled` flag controls the creation of NAT Gateways in the public subnets. The private subnets are routed to the NAT Gateways provided in the `var.az_ngw_ids` map. If you are creating subnets inside a VPC, consider using [cloudposse/terraform-aws-dynamic-subnets](https://github.com/cloudposse/terraform-aws-dynamic-subnets) instead.