Add support for router less deployments

contrib/terraform/openstack/README.md

contrib/terraform/openstack/kubespray.tf

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

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

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

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

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

contrib/terraform/openstack/variables.tf