Webhook token auth:
https://kubernetes.io/docs/reference/access-authn-authz/authentication/#webhook-token-authentication

Fixes #3063.

Fix GPU node Scheduling

* controlPlaneEndpoint set up through load balancer should be possible  even in single master setups

Enable load balancer for single-master setups
Fixes an issue where single-master setups are not reachable using the usual admin.conf from outside the cluster. 

controlPlaneEndpoint set up through load balancer should be possible  even in single master setups

* add fix to other api versions

* remove obsolete check completely

* remove check, pass 2

* removes checks in client configuration

* delete 'and'

download v1.12.3 kubernetes images failed

Delete unused controlPlane for join node

Fix installation using CRIO about download images failed

it is used for join master or use --experimental-control-plane argments

- NOTE: it assumes that the 'latest' version is newer than 17.05

Upgrade kubernetes to v1.13.1

* Add images downloader to download roles

* Use single jinja2 templates

* add kube_version to templates

Signed-off-by: Ganesh Maharaj Mahalingam <ganesh.mahalingam@intel.com>

* add vars for cilium init container

* make yamllint happy

* add var cilium_init in downloads

Signed-off-by: Ganesh Maharaj Mahalingam <ganesh.mahalingam@intel.com>

since bad886ca, dns_mode is set to coredns by default instead of kubedns

* Metrics server resizer addon should target metrics server deployment

* Target metrics server deployment without version

Adding fact is_atomic in bootstrap-centos.yml.

Fix issue: #3538

* Add support for running a nodelocal dns cache

After encountering dns issues in a cluster I was recently working on I
noticed Kubernetes 1.13 introduced support for running a nodelocal dns
cache.

I believe this can usefull for more people.

https://github.com/kubernetes/kubernetes/commit/73b548db06c5e293533344c5b6171e955eac9ff1
https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/0030-nodelocal-dns-cache.md

* Add requested changes

* Add additional requested changes + documentation

* Add requested changes after review

* Replace incorrect variable

Metrics port is exposed through a service for CoreDNS but not for kube-dns.

Related to https://github.com/kubernetes-sigs/kubespray/pull/3684