Cleanup legacy syntax, spacing, files all to yml

speed up etcd preupgrade check

Update calico-cni to 1.5.6

fix typos in azure docs

fix load balancer DNS name index evaluation in openssl.conf

Update Kubernetes to v1.5.3

Signed-off-by: Sergii Golovatiuk <sgolovatiuk@mirantis.com>

Update Doc

Put Ansible requirements first

And re-phrase all sentences to passive tense

Safe disable SELinux

Sometimes, a sysadmin might outright delete the SELinux rpms and
delete the configuration. This causes the selinux module to fail
with
```
IOError: [Errno 2] No such file or directory: '/etc/selinux/config'\n",
"module_stdout": "", "msg": "MODULE FAILURE"}
```

This simply checks that /etc/selinux/config exists before we try
to set it Permissive.

Update from feedback

This generates too much output and during upgrade scenarios
can bring us over the 4mb limit.

Skip nodes not in ansible play (via --limit)

This works around 4MB limit for gitlab CI runner.

New deploy modes: scale, ha-scale, separate-scale
Creates 200 fake hosts for deployment with fake hostvars.

Useful for testing certificate generation and propagation to other
master nodes.

Updated test cases descriptions.

Migrate older inline= syntax to pure yml syntax for module args as to be consistant with most of the rest of the tasks
Cleanup some spacing in various files
Rename some files named yaml to yml for consistancy

Add graceful upgrade process

Calico does not allow renaming hosts

Fix fact tags

Ansible playbook fails when tags are limited to "facts,etcd" or to
"facts". This patch allows to run ansible-playbook to gather facts only
that don't require calico/flannel/weave components to be verified. This
allows to run ansible with 'facts,bootstrap-os' or just 'facts' to
gether facts that don't require specific components.

Signed-off-by: Sergii Golovatiuk <sgolovatiuk@mirantis.com>

Mount host's /var/log into kubelet container

Better control instance sizing

Fix references to CoreOS and Container Linux by CoreOS

fix typo in "kibana_base_url" variable name

* Git ignore the user controlled config.rb.
* Ability to better control the number of instances running.

Kubelet is responsible for creating symlinks from /var/lib/docker to /var/log
to make fluentd logging collector work.
However without using host's /var/log those links are invisible to fluentd.

This is done on rkt configuration too.