Updated the module with proper documentation.

Support the state parameter in the list_vms command to filter the
VM's to list based on their state.

Module for managing users, tenants, and roles within OpenStack.

This module handles AWS EC2 ELB registration.

* De-registration requires the instance id which can be looked up using
  the ec2_facts module.
* Registration requires both the instance id and the elbs that the
  instance belongs to.

De-registration will return an ec2_elb fact that can be used for
registration in post_tasks.