Mark "calico-rr" as optional in fact gather

Support multiple artifacts under individual inventory directory

change expirations period for generated certificate from 10y to 100 years

Add CoreDNS support

Added CoreDNS to downloads

Updated with labels. Should now work without RBAC too

Fix DNS settings on hosts

Rename CoreDNS service from kube-dns to coredns

Add rotate based on http://edgeofsanity.net/rant/2017/12/20/systemd-resolved-is-broken.html

Updated docs with CoreDNS info

Added labels and fixed minor settings from official yaml file: https://github.com/kubernetes/kubernetes/blob/release-1.9/cluster/addons/dns/coredns.yaml.sed

Added a secondary deployment and secondary service ip. This is to mitigate dns timeouts and create high resitency for failures. See discussion at 'https://github.com/coreos/coreos-kubernetes/issues/641#issuecomment-281174806'

Set dns list correct. Thanks to @whereismyjetpack

Only download KubeDNS or CoreDNS if selected

Move dns cleanup to its own file and import tasks based on dns mode

Fix install of KubeDNS when dnsmask_kubedns mode is selected

Add new dns option coredns_dual for dual stack deployment. Added variable to configure replicas deployed. Updated docs for dual stack deployment. Removed rotate option in resolv.conf.

Run DNS manifests for CoreDNS and KubeDNS

Set skydns servers on dual stack deployment

Use only one template for CoreDNS dual deployment

Set correct cluster ip for the dns server

Fix vsphere cloud_provider RBAC permissions

Sync Upstream

Add support to kubeadm too

Make sure output from extra args is strings

Enable encrypting the secrets

Enable the CI test to check the encryption of secrets

* Added option for encrypting secrets to etcd

* Fix keylength to 32

* Forgot the default

* Rename secrets.yaml to secrets_encryption.yaml

* Fix static path for secrets file to use ansible variable

* Rename secrets.yaml.j2 to secrets_encryption.yaml.j2

* Base64 encode the token

* Fixed merge error

* Changed path to credentials dir

* Update path to secrets file which is now readable inside the apiserver container. Set better file permissions

* Add encryption option to k8s-cluster.yml

Fix error in kubelet.kubeadm.env.j2

Setting the following:

```
kube_kubeadm_controller_extra_args:
  address: 0.0.0.0
  terminated-pod-gc-threshold: "100"
```

Results in `terminated-pod-gc-threshold: 100` in the kubeadm config file. But it has to be a string to work.

1. 404 link url
2. kubelet_authentication_token_webhook is not work
3. kube_reserved variable set twice

add support for azure vnetResourceGroup

uses new kube_memory_reserved/kube_cpu_reserved variables in kubelt

Explicitly defines the --kubelet-preferred-address-types parameter #2418

Fixes #2453

Add remove node to getting-started doc

use archive instead of command

Fix yamllint roles error for #2188 commit

Fix Docker exits prematurely

Fix issues #2451 Support docker-ce and docker-engine

fix nodePort for weave

Fix indexing of supplementary DNS in openssl.conf

Explicitly defines the --kubelet-preferred-address-types parameter

details:https://github.com/moby/moby/pull/31490/files