Add an Ansible playbook to deploy the management hub all-in-one.

The proposed change would add an Ansible playbook and role to install, uninstall, and manage the management hub. This would wrap the existing "deploy-mgmt-hub.sh" script. The Ansible role would also provide utilities to manage organizations and users through the exchange API. The configuration for the Ansible role may be given as an environment file, a YAML document, or as a combination of the two.

Users and orgs will be declared in YAML, and the playbook will ensure that users and groups declared in the file exist when it is run. Users and orgs not present in the file will be cleaned up.

The purpose of this is to enable end users to maintain an inventory of one or more management hub instances in a declarative manner.