(CPR-54) Move ship_repo_configs into Pkg::{Rpm,Deb}::Repo

Rather than invoke rake tasks from the newly librarified deb repos
methods, it is far cleaner to invoke other ruby methods. This commit
breaks up the ship_repo_configs task into a Deb and Rpm version and adds
it to the Deb and Rpm repos modules. The ship.rake task is also updated
to invoke both methods.
(maint) Style points

Updates the PR for style, including:
- Space after comma
- Space after {, before }
- Parens around most method calls (except puts, raise, fail)