Add etcd-procedures repository

[makentenza]

What is this PR About?

Resources to operate an etcd Cluster for Openshift. This repository will contain different documents and playbooks to operate etcd. This PR is covering the first procedure, scale up an etcd Cluster. A document with detailed steps is provided and a playbook is included as well in order to automate the process.

How do we test this?

Manual steps: Follow instructions from docs/README.md Automatic playbook: Follow instructions from playbooks/README.md

cc: @redhat-cop/openshift-toolkit

[makentenza]

@etsauer The case is that this repository will contain at least the following procedures:

• Add new member to an existing Cluster
• Remove a member from an existing Cluster
• Replace members from an existing Cluster
• Disaster Recovering

Is the same info you can see in the README.adoc for the repository. That's why the initial name come to my mind was "procedures". If you think it does make more sense to create separate repositories for each Procedure we could discuss it, but in this particular case I'm not really sure if it does, as from an automation point of view we will reuse Ansible playbooks/roles and these will be duplicated in different repositories, so maintain that would be more difficult.

[etsauer]

@makentenza looks like you need to rebase your branch.

[makentenza]

@etsauer this is now solved. PTAL