* GCP Persistent Disk CSI Driver deployment

* Fix MD lint

* Fix Yaml lint

* AWS EBS CSI implementation

* Fixing image repos

* Add OWNERS file

* Fix expressions

* Add csi-driver tag

* Add AWS EBS prefix to variables

* Add AWS EBS CSI Driver documentation

* Deploy Cinder CSI driver to provision volumes over OpenStack

* Deploy Cinder CSI StorageClass

* Cinder CSI doc

* Support Metrics Server as addon (#3560).

* Update metrics server v0.3.1.

* Add metrics server test.

* Replace metrics server manifests with kubernetes/cluster/addons's.

* Modify metrics server manifests for kubespray.

* Follow PR#3558 node label node-role.kubernetes.io/master change

* Fix metrics server parameters base_metrics_server_... to metrics_server_...

* Fix too hard corded metrics_server_memory_per_node

* Add configurable insecure tls for metrics-apiservice

* Downloadable addon-resizer and extract parameter as variables

* Remove metrics server version from deployment name

* Metrics Server work when all masters has node role

* Download metrics-server and add-resizer container only on master

* ServiceAccount and ConfigMap is separated and fix application name

* Remove old metrics server clusterrole template

* Fix addon-resizer image specify

* Make InternalIP default for metrics_server_kubelet_preferred_address_types

Make InternalIP default because multiple preferrred address types does not work.

Signed-off-by: Jeff Bornemann <jeff.bornemann@oracle.com>

Use helm install or support in future

Kubespray should not install any helm charts. This is a task
that a user should do on his/her own through ansible or another
tool. It opens the door to wrapping installation of any helm
chart.

install using Helm:
- Prometheus Operator
- metrics for k8s cluster including: grafana dashboard, alertmanager, node exporters

base project:
https://github.com/coreos/prometheus-operator

the issue:
https://github.com/kubernetes-incubator/kubespray/issues/2042

Previous PR, raw ansible without Helm:
https://github.com/kubernetes-incubator/kubespray/pull/2499

1.Disalbe install epel-release rpm on Centos/Redhat
2.Use yum install epel-release

Add possibility to create default OpenStack Cinder Storage Class

Closes: #1609

* Refactor downloads to use download role directly

Also disable fact delegation so download delegate works acros OSes.

* clean up bools and ansible_os_family conditionals

* add istio addon

* add addons to a ci job

* Adding yaml linter to ci check

* Minor linting fixes from yamllint

* Changing CI to install python pkgs from requirements.txt

- adding in a secondary requirements.txt for tests
- moving yamllint to tests requirements

By default Calico CNI does not create any network access policies
or profiles if 'policy' is enabled in CNI config. And without any
policies/profiles network access to/from PODs is blocked.

K8s related policies are created by calico-policy-controller in
such case. So we need to start it as soon as possible, before any
real workloads.

This patch also fixes kube-api port in calico-policy-controller
yaml template.

Closes #1132

Migrate older inline= syntax to pure yml syntax for module args as to be consistant with most of the rest of the tasks
Cleanup some spacing in various files
Rename some files named yaml to yml for consistancy

Netchecker is rewritten in Go lang with some new args instead of
env variables. Also netchecker-server no longer requires kubectl
container. Updating playbooks accordingly.

Change version for calico images to v1.0.0. Also bump versions for
CNI and policy controller.

Also removing images repo and tag duplication from netchecker role