Consider eliminating install_prerequisites.py and just telling people what to install #284
Description
It is generally considered bad practice to make running a script the canonical way to satisfy system package dependencies. Instead, we should provide instructions telling users what commands to run to enable the proper repositories and get fpm working. This will make it easier for users with specific needs to prepare their system for building externals, and for users on distros we do not support to figure out what they need to do.
With this change, it won't really make sense for the externals builder Dockerfiles to live in irods/irods_development_environment any more, so we should also consider migrating them here.