Add libffi-dev to the list of required Debian packages.
Add libffi-dev to the list of required Debian packages.

This package is needed to install Ansible 2.1.2.0, used by the activity
report management command and the load balancer reconfiguration playbook.

open-craft/opencraft,open-craft/opencraft,open-craft/opencraft,open-craft/opencraft,open-craft/opencraft