[RFE] Multi-cluster deployment

[elmazzun]

Hi!

I was thinking of deploying more than one cluster with a single terraform apply in order to test some intra-cluster communication with Istio.

I think a new parameter for kind_cluster resource (something like clusters_count) would be nice because it would allow to deploy multiple cloned clusters.

There might be some details that I am missing in order to implement this but, at first thought, some extra steps would be required such as:

• multiple kubeconfig files, one for each cluster
• automatic increase of kind_config.node(master).extra_port_mappings.host_port so that there would be no ports conflicts
• ... something else?

Thanks