Support ipvs mode for kube-proxy

Raise drain timeout to 5m

* iptables: flush nat table as well as filter table upon reset

* Indentation fix

Renamed variable from disable_volume_zone_conflict to volume_cross_zone_attachment and removed cloud provider condition; fix identation

Fix 'no such host' problem reported by commands *kubectl logs* and *kubectl exec*
when cloud_provider is OpenStack

Closes: #2147

* Add support for cert alt names for etcd

* Update gen_certs_vault.yml

Auto configure API access endpoint with a custom bind IP, if provided.
Fix HA docs' http URLs are https in fact, clarify the insecure vs secure
API access modes as well.

Closes: #issues/2051

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

Remove blank lines

Update checksum for kubeadm
Use v1.9.0 kubeadm params
Include hash of ca.crt for kubeadm join
Update tag for testing upgrades
Add workaround for testing upgrades
Remove scale CI scenarios because of slow inventory parsing
in ansible 2.4.x.

Change region for tests to us-central1 to
improve ansible performance

This does not update v1.9.0, but fixes two incompatibilities
when trying to deploy v1.9.0.

Starting with Kubernetes v1.8.4, kubelet ignores the AWS cloud
provider string and uses the override hostname, which fails
Node admission checks.

Fixes #2094

Renaming runtime docker_version to prevent setting that
value on the command line from breaking the play run.

This fixes #2081

Add possibility to create default OpenStack Cinder Storage Class

Closes: #1609

Ansible cannot seem to handle omitting delegate_to since v2.4.0.0.

Possibly related: https://github.com/ansible/ansible/issues/30760

Update dependencies to be compatible with Kubernetes v1.8

As we have seen with other containers, sometimes container removal fails on the first attempt due to some Docker bugs. Retrying typically corrects the issue.