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that had been replaced by templates.
http://puppet-compiler.wmflabs.org/2898/carbon.wikimedia.org/
Bug:T132757
Change-Id: Ie259b939971a5affed178ed25c31373de1110e57