* [jjo] add DIND support to contrib/

- add contrib/dind with ansible playbook to
  create "node" containers, and setup them to mimic
  host nodes as much as possible (using Ubuntu images),
  see contrib/dind/README.md

- nodes' /etc/hosts editing via `blockinfile` and
  `lineinfile` need `unsafe_writes: yes` because /etc/hosts
  are mounted by docker, and thus can't be handled atomically
  (modify copy + rename)

* dind-host role: set node container hostname on creation

* add "Resulting deployment" section with some CLI outputs

* typo

* selectable node_distro: debian, ubuntu

* some fixes for node_distro: ubuntu

* cpu optimization: add early `pkill -STOP agetty`

* typo

* add centos dind support ;)

* add kubespray-dind.yaml, support fedora

- add kubespray-dind.yaml (former custom.yaml at README.md)
- rework README.md as per above
- use some YAML power to share distros' commonality
- add fedora support

* create unique /etc/machine-id and other updates

- create unique /etc/machine-id in each docker node,
  used as seed for e.g. weave mac addresses

- with above, now netchecker 100% passes WoHooOO!
  🎉 🎉 🎉

- updated README.md output from (1.12.1, verified
  netcheck)

* minor typos

* fix centos node creation, needs earlier udevadm removal to avoid flaky facts, also verified netcheck Ok \o/

* add Q&D test-distros.sh, back to manual /etc/machine-id hack

* run-test-distros.sh cosmetics and minor fixes

* run-test-distros.sh: $rc fix and minor formatting changes

* run-test-distros.sh output cosmetics

* Added Priority class to tiller installation and also fixed tiller override implementation.

* Added changes to handle priority classes separately in tiller, instead of using the variable tiller_override

* Added changes to clean up orphan containers and reload docker & kubelet directories.

* Added new files for cleaning up orphans and docker & kubelet directories

* Added new lines at the end of these files

* removed the trailing whitespaces from main.yml and clean-up.yml

* Updated as per the review comments

* Updated as per the review comments

* Removed service_facts and package_facts because they are not supported in ansible 2.4.0

* Corrected yaml syntax errors

* Removed the use of json_query filter and utilized selectattr

* Removed trailing spaces

* Changed the default value of docker_clean_up to false

* Added Changes to only include cleanup-docker-orphans.sh

* Reverted back changes done inside handler.

* Removed trailing spaces and made default value of docker_orphan_clean_up as true

* Reverted the default value of docker_orphan_clean_up as false

* Made the docker clean up as drop in

* Made the docker clean up as drop in

* Reverted the value of boolean docker_orphan_clean_up to false

* Allow configuration of nginx proxy config path

* Fix the internal nginx configuration location

Signed-off-by: Johann Queuniet <contact@lordran.net>

* Update pre-install verify settings with network checks and etc.

* Remove upstream dns server check. It's bogus

* Update CoreDNS templates to newest version

* Add watch to ClusterRole. Fixes #3460

* Automatically infer bootstrap_os

* Rename bootstrap os to os_family

* #3475 - make dnsmasq to send queries to all servers in upstream. Make dnsmasq config file customizable.

* Code style fixes. Return current behaviour for dnsmasq strict-order flag.

* Fix bootstrap_os/ubuntu idempotency

* Update bastion role

* move container_engine in sub-roles

* requires ansible 2.5

* ubuntu18 as first CI job

* Ability to specify ssl certificate duration and ssl key size - etcd/secrets

* Ability to specify ssl certificate duration and ssl key size - helm/contiv + fix contiv missing copy certs generation script

* Fix DNS loop when resolvconf_mode is set to host_resolvconf

* Make sure upstream_dns_servers is defined when using resolvconf_mode == 'host_resolvconf'

* Only set upstream dns servers on KubeDNS and CoreDNS if they are defined

* Only set upstream dns servers on KubeDNS and CoreDNS if they are defined

https://github.com/kubernetes/kubernetes/issues/69214

- Local Volume StorageClass configuration is now manged by `local_volume_provisioner_storage_classes`, a list of maps that specifies local storage classes with `name` `host_dir` and `mount_dir` keys per entry
- Tasks and templates updated to loop through local volume storage classes
- Previous defaults for path/class names were not changed
- Fixed an issue where a `kubernetes/preinstall` was creating directories inconsistently with the `kubernetes-apps/external_provisioner/local_volume_provisioner` task

* Upgrade kubernetes to v1.12.0

Use kubeadm v1alpha3 config

* Upgrade coredns and etcd

* Upgrage docker to 18.06

* Fix the jinja expression for openstack_tenant_id

OS_PROJECT_ID is obsolete in keystone v3 and jinja expression
doesn't set openstack_tenant_id as expected because of
undefined env var. Fixed the expression.

* Fix the dic iteration method in the kubelet template

Kubelet template rendering errors when additional Node lables are
added and using Python3. Update the method to be compatible to both
python2/3

Node lables doesn't work

According to the documentation, container images are described
by vars like `foo_image_repo` and `foo_image_tag`.
The variables netcheck_{agent,server}_{img_repo,tag} do not
follow that convention.

* Better fix for openstack cinder zone issue[1][2]
using ignore-volume-az option[3].
[1]: https://github.com/kubernetes-incubator/kubespray/pull/2155
[2]: https://github.com/kubernetes-incubator/kubespray/pull/2346
[3]: https://github.com/kubernetes/kubernetes/pull/53523

* Remove kube-scheduler-policy.yaml

Before, Nodes tainted with NoExecute policy did not have calico/weave Pod.
Network pod should run on all nodes whatever happens on a specific node.

Also always set the Pods to be critical.
Also remove deprecated scheduler.alpha.kubernetes.io/tolerations annotations.

* fixes: #3387

* Change execution order for pip

* Remove spaces

* Changes to assign pod priority to kube components.

* Removed the boolean flag pod_priority_assignment

* Created new priorityclass k8s-cluster-critical

* Created new priorityclass k8s-cluster-critical

* Fixed the trailing spaces

* Fixed the trailing spaces

* Added kube version check while creating Priority Class k8s-cluster-critical

* Moved k8s-cluster-critical.yml

* Moved k8s-cluster-critical.yml to kube_config_dir