Refactor k8s scenario configuration

Use of files and copying them over makes bumping kubespray
versions more difficult since while kubespray gets developed,
new stuff is added into and removed from k8s-cluster.yml file
and it is problematic to do bumps by doing line by line
comparison within the diff.

This change removes the locally kept k8s-cluster.yml file and
instead updates the lines we care such as kubeconfig_localhost
and kube_network_plugin.

If certain scenarios need total copy of k8s-cluster,yml file,
it can then be enabled for that scenario only.

Change-Id: I0b5d5d2db3faddd590b10fddae4d39dd3adc9e25
2 files changed