Install standard Python modules sqlite3 and gbdm on FreeBSD

Summary:
These two modules are standard and normally included in Python,
but on FreeBSD, there are separate packages as they have more
dependencies.

A third discarded module is tkinter, but we don't have an use case,
as servers currently don't provide a GUI.

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1351