Update Calico to 2.4.1 release.

* Added private key file to ssh bastion conf

* Used regular if condition insted of inline conditional

Enable scheduling of critical pods and network plugins on master

Added toleration to DNS, netchecker, fluentd, canal, and
calico policy.

Also small fixes to make yamllint pass.

* 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

If Kubernetes > 1.6 register standalone master nodes w/ a
node-role.kubernetes.io/master=:NoSchedule taint to allow
for more flexible scheduling rather than just marking unschedulable.

Prior this would fail because we didnt set max ttl for vault temp

- Switched Calico images to be pulled from quay.io
- Updated Canal too

Add node to docs about kubelet deployment type changes

Change kubelet deploy mode to host
Enable cri and qos per cgroup for kubelet
Update CoreOS images
Add upgrade hook for switching from kubelet deployment from docker to host.
Bump machine type for ubuntu-rkt-sep

[WIP] Support pbr builds and prepare for RPM packaging as the ansible-kubespray artifact

* Fix Typo etc3 -> etcd3

* Fix typo in post-upgrade of master. stop -> start

* Added custom ips to etcd vault distributed certificates

* Added custom ips to kube-master vault distributed certificates

* Added comment about issue_cert_copy_ca var in vault/issue_cert role file

* Generate kube-proxy, controller-manager and scheduler certificates by vault

* Revert "Disable vault from CI (#1546)"

This reverts commit 781f31d2.

* Fixed upgrade cluster with vault cert manager

* Remove vault dir in reset playbook

add possibility to ignore the hostname override

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

https://github.com/kubernetes-incubator/kubespray/issues/1545

* Bump tag for upgrade CI, fix netchecker upgrade

netchecker-server was changed from pod to deployment, so
we need an upgrade hook for it.

CI now uses v2.1.1 as a basis for upgrade.

* Fix upgrades for certs from non-rbac to rbac

This aligns calico component versions with Calico release 2.1.5 and
fixes an issue with nodes being unable to schedule existing workloads
as per [#349](https://github.com/projectcalico/cni-plugin/issues/349)

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

This does not address per-node certs and scheduler/proxy/controller-manager
component certs which are now required. This should be handled in a
follow-up patch.

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

Required for an RPM package builds with the contrib/ansible-kubespray.spec

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

Install roles under /usr/local/share/kubespray/roles,
playbooks - /usr/local/share/kubespray/playbooks/,
ansible.cfg and inventory group vars - into /etc/kubespray.
Ship README and an example inventory as the package docs.
Update the ansible.cfg to consume the roles from the given path,
including virtualenvs prefix, if defined.

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

Update Community Code of Conduct from kubernetes/kubernetes-template-project

Minor grammar fixes