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.

Fix kubespary rpm spec file some requires

Added support for kubelet webhook authentication/authorization

README.md update for default component versions

Integrate kubernetes/ingress-nginx 0.10.2 to Kubespray