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

Support docker-ce and docker-engine include redhat/centos ubuntu debian

FIXUP #2424: local_provisioner directory should be created only if enabled

Update OpenStack contrib to use per-cluster inventory layout

Fix kubernetes cert permission sync

Prefix system:node CRB

Add `state: directory` to `file` task so that `recurse: yes` will actually take effect and ensure
certs/keys have the right file mode and owner

Change the name of `system:node` CRB to `kubespray:system:node` to avoid
conflicts with the auto-reconciled CRB also named `system:node`

Fixes #2121

Fix always download calico_rr image

Fix systemd version detection

clean http-proxy.conf

Remove nodes

Drain node except daemonsets resource
Use reset cluser for delete deploy data
Then delete node

Enable OOM killing for etcd-events

fix the name of some variable

kube Module Enhancements

* Multiple files are now supported across operations.
  * Can be specified as a list or a comma separated string.
  * Single item per task params will still work without changes.
* Added `files`, `filenames`, and `file`, as aliases for the `filename` param.
* Improved output of error message to always include stderr
* `exists` now supports checking files

Follow up PRs encouraged across roles to start converting `with_items` loops on `kube` tasks into `files` param lists so we can improve performance.

Change "command" to "shell" in order for the pipe to work correctly

Add Custom ConfigMap Support for ingress-nginx

Remove DigitalOcean

add tip to large-deployments.doc

* Use docker-ce 17.03.2
* Docker-engine may be discarded

Support Centos/Fedora atomic host

set the ``etcd_events_cluster_setup: true`` store events
in a separate dedicated etcd instance.

Add labels for ingress_nginx_namespace

Adding ssh_private_key_file to ProxyCommand

Enable OOM killing like docker run etcd

This is trying to match what the roles/bastion-ssh-config is trying to do. When the setup is going through bastion, we want to ssh private key to be used on the bastion instance.