Refactor repository/package management to allow pulling upstream packages through a mirror (not a proxy)

[LongLiveCHIEF]

I should be able to specify a repository url instead of just a "version", and have this module manage that repository without having to completely disable repository management in this module, and handle it in my own.

I should be able to pass in any apt or yumrepo parameters that are supported based on my own versions of those environment modules on my base modulepath, instead of being required to use the latest. This means I can upgrade my apt environment basepath module when it makes sense for all the component modules in my controlrepo, instead of having to worry about compatibility with this module vs compatibility with other modules in my control repo that don't support newer version of the apt module.