Create OpenStack infra using Terraform

Resources we need: https://gitlab.stud.idi.ntnu.no/jhklemet/iikg3005-labs/-/blob/master/lab1.md

Provider to use: https://registry.terraform.io/providers/terraform-provider-openstack/openstack/latest/docs

• Configure the Terraform file to use Gitlab HTTP backend (https://docs.gitlab.com/ee/user/infrastructure/iac/terraform_state.html)
• Create a Terraform file to create infra in OpenStack
• Convert the file into a module which can be configured with number of instances/nodes to create
• Write tests for the module using Terratest