* Manage containerd.io package with docker CRI.

* Refactor common containerd stuff to separate role

* Fix check mode and unnecessary shell.

* Add docker-ce 19.03 packages for Debian & Ubuntu

K8s has updated the recommended Docker version to 19.03. More
specifically it should be 19.03.4, but since we used 18.06.7 instead of
.2, I'm assuming the latest patch version should be used here as well.

* Add docker 19.03 for redhat

This 38688a44 change replaces the
value for dockerproject_.+_repo_.+ docker variables but their new
value was previously defined in other variables. This change removes
the dockerproject_.+_repo_.+ docker variables in favor of the older
ones.

As of kubernetes v1.14, docker 18.09 is [validated for use](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.14.md#external-dependencies). Docker 1.11 and 1.12 were dropped.

This patch:
- Updates the default docker version to 18.09
- Updates Docker packages to the latest 18.09 patch (18.09.5)
- Removes options for Docker 1.11 and 1.12

For some reason 18.09 packages are now prefixed with `5:` in the download.docker.com apt repos
Followup to #4236

This updates docker 18.06 and 18.09 with the two patches released
yesterday to address the new runc exploit. Details here:
https://kubernetes.io/blog/2019/02/11/runc-and-cve-2019-5736/

Docker 18.09.1 is out and it includes some fixes that are quite critical for RHEL distros, details here: https://docs.docker.com/engine/release-notes/#18091

* Fix bootstrap_os/ubuntu idempotency

* Update bastion role

* move container_engine in sub-roles

* requires ansible 2.5

* ubuntu18 as first CI job

* Upgrade kubernetes to v1.12.0

Use kubeadm v1alpha3 config

* Upgrade coredns and etcd

* Upgrage docker to 18.06

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

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

Update default docker version to 17.03.1

This allows overriding of apt repo endpoints when internet sources are not accessible. Additionally, switch to using the dockerproject.org gpg key url for apt instead of keyservers.net

* 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

docker-ce is not the .deb package until the repositories are switched over to new "downloads" docker webserver

- Only have ubuntu to test on
  - fedora and redhat are placeholders/guesses
  - the "old" package repositories seem to have the "new" CE version which is `1.13.1` based
- `docker-ce` looks like it is named as a backported `docker-engine` package in some
  places

- Did not change the `defaults` version anywhere, so should work as before
- Did not point to new package repositories, as existing ones have the new packages.

The default version of Docker was switched to 1.13 in #1059.  This
change also bumped ubuntu from installing docker-engine 1.13.0 to
1.13.1.  This PR updates os families which had 1.13 defined, but
were using 1.13.0.

The impetus for this change is an issue running tiller 1.2.3 on
docker 1.13.0.  See discussion [1][2].

[1] https://github.com/kubernetes/helm/issues/1838
[2] https://github.com/kubernetes-incubator/kargo/pull/1100

Fixes #903

Note the new ubuntu/debian version string change:
https://github.com/docker/docker/issues/29355

This will allow to use '-e docker_version=1.12' in ansible playbook
execution. It's also backward-compatible and will work with floating
docker_version format in custom yaml files.

Closes #702

Default version is still unchanged, but added docker versions 1.11 and 1.12

This allows Ubuntu/Debian to downgrade Docker version if
a newer version is installed, instead of failing.