* add metallb as loadbalancer for on premise deployments

* improve configuration

* add variables to DaemonSet

Remove duplicate hostname usage.

allow masters, nodes and gluster nodes (within each group) to be scheduled
on differents AZ.

Attempting to clarify the language surrounding the etcd node deployment script failure mechanism. I had this error when doing a new cluster deployment last night and, though it should have been, it wasn't immediately apparent to me what was causing the issue (since my default master node hostnames do not specify whether they are also acting as etcd replicas).

This will make NodePort services work out of the box

Add TF_VAR_ to terraform env

* Add supplementary node groups

  To add additional ansible groups to the k8s nodes, such as
  `kube-ingress` for running ingress controller pods. Empty by default.

volumes