xci: Add k8-nosdn-nofeature role

xci: Add k8-nosdn-nofeature role

Move default k8s-cluster.yml from kubespray/files/ to
role/k8-nosdn-nofeature/files/k8s-cluster.yml since it's scenario
specific. Moreover, we set 'cloud' as kube_network_plugin, which would
use kubnet as network plugin. The kubenet network plugin requires
routing between to be setup by the administrator so we need to add
static routes on every host since they are connected using a bridge
instead of a router.

installer-type:kubespray
deploy-scenario:k8-nosdn-nofeature

Change-Id: I6ab7288c966d7f17e9d61279056f7673be37bebe
Signed-off-by: wutianwei <wutianwei1@huawei.com>
Signed-off-by: Markos Chandras <mchandras@suse.de>