Make RKE the default cluster deployment tool

This change substitutes rancher_kubernetes.yml for
rke.yml in site.yml making the RKE default deployment
mechanism for kubernetes cluster.

Change-Id: Ie1a0cb1eb94a3c5e8efd5c2c7e682c0292bc9152
Issue-ID: OOM-1873
Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
3 files changed