Ansible CI updates

[rleigh-codelibre]

• Update to use 2.4 include_tasks
• Fix a couple of MacOS X portability bugs
• Small FreeBSD maven fix
• MacOS X sudoers configuration
• MacOS X homebrew configuration

With these changes, it's now possible to completely deploy the base system on MacOS X:

cd ansible/ci-playbooks
ansible-playbook -l mackerel.openmicroscopy.org -i /path/to/management_tools/ansible/inventory/ci-openstack-hosts ./ci-setup.yml

ssh to ci-admin@mackerel.openmicroscopy.org to confirm that homebrew has been installed. A future pull request will then install packages with this basic support in place.

[joshmoore]

Ok. Merging, but that leaves us with two different discussions that need to be managed: versions & role layouts.