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Stack create and delete take an option to wait for the operation to
complete. It doesn't actually wait for the operation to complete, just
for the Openstack side of it to be done. For creation for exemple, the
nodes might still be booting.

Ansible recommend a specific directory layout to deal with complex
playbooks. As we expect this configuration to become trickier, let's
adopt good practices right away.

Previous code was blocking on stdout after subprocess completed with
success, as `poll()` would return 0, and `not 0` is true.

Region support

See merge request !1

Reflecting changes in OpenRC file after Chameleon update on 2018/05/29.

Just realized that the blockquotes were not the right format for command
lists. Should be using code blocks instead.

Add a script to help with general configuration issues.

More doc to explain what is going on in these scripts.

ansible/inventory.yaml is generated by `chi-appliance configure`

Supporting the two regions of chameleon (TACC & UC) requires changes
in the clouds.yaml/secure.yaml format, to avoid having a secure file
with twice the info. We use the region support in os-client-config for
that.

I had to change the scripts a little bit, as the cloud name is now fixed
but the region_name has to be specified.

Forgot to add the pipenv install command to make sure that the
dependencies are installed on a new machine.

Thanks to @tpatki

Will allow appliance management more easily, in a script separated from
the lease stuff.

Uses ansible under the hood to configure the appliance.

This is not ideal. Ansible has tons of issues when we launch it from
there, and the configuration become tedious.

It might be easier to deploy ansible on the frontend and rerun
everything inside, or to create a python script that deals with ansible
directly.

Add an option to create haswell allocations, but default to skylake
nodes.

Skylakes are required for power management.

Using pipenv as the environment manager, implement as clouds.yaml
workflow and a script to manage leases on chameleon.

Note that the clouds.yaml only support chi-tacc for now. We will need to
add another region for UC later.

Derived from the complex appliances documentation.
I'm still in the process of understanding the whole softwareconfig part,
but it's a start.