Terraform quoted references are now deprecated (#6203)

contrib/terraform/aws/create-infrastructure.tf

contrib/terraform/aws/modules/elb/main.tf

contrib/terraform/aws/modules/elb/outputs.tf

contrib/terraform/aws/modules/iam/main.tf

contrib/terraform/aws/modules/iam/outputs.tf

contrib/terraform/aws/modules/vpc/main.tf

contrib/terraform/aws/modules/vpc/outputs.tf

contrib/terraform/aws/output.tf

contrib/terraform/openstack/kubespray.tf

contrib/terraform/openstack/modules/compute/main.tf

contrib/terraform/openstack/modules/ips/main.tf

contrib/terraform/openstack/modules/ips/outputs.tf

contrib/terraform/openstack/modules/network/main.tf

contrib/terraform/openstack/modules/network/outputs.tf