Network access restrictions to EKS

[petrkohut]

Since 20th of December 2019 there is support for Network access restrictions on EKS:
https://aws.amazon.com/about-aws/whats-new/2019/12/amazon-eks-enables-network-access-restrictions-to-kubernetes-cluster-public-endpoints/

We would like to add support for it in Taurus, so part of Terraform configuration would be a map of whitelisted IP addresses to EKS. Everything else would be blocked.

[thecodingrobot]

This is blocked by:

1. The Terraform AWS provider containing the change is not published yet. v2.44.0 should be available within the next few days.
   Ref.: Amazon EKS cluster public endpoint network access restriction via IPv4 address ranges hashicorp/terraform-provider-aws#11397

2. The external Terraform module used to deploy EKS does not support public IP whitelisting.
   Ref.: Add support for Public IP Access Whitelist terraform-aws-modules/terraform-aws-eks#647