install_server: split out reprepro to module aptrepo
Split the reprepro role out of the install_server module
as Faidon said on T132757.
Merge apt_repository into init.pp.
Rename module to "aptrepo", role to aptrepo::wikimedia.
Remove all the duplicate definitions of files and files
that had been replaced by templates.
changes on carbon itself as minimal as possible in this change: