[feature] Add support for Openstack API

[S0obi]

Description

OpenStack is a free, open standard cloud computing platform. It is mostly deployed as infrastructure-as-a-service (IaaS) in both public and private clouds where virtual servers and other resources are made available to users.

Source : Wikipedia

Ability to display server names and ip adresses in specific or all tenants.

Describe the solution you'd like
Add Openstack as a new cloud provider to cloudlist. gophercloud seems to be an interesting library to implement Openstack API interactions.

I may be interested developing this feature myself if main contributors are open to the idea of adding this provider.

[ehsandeep]

I may be interested developing this feature myself if main contributors are open to the idea of adding this provider.

@S0obi please feel free to open a PR for this.