simplify Debian versioning
simplify Debian versioning

Summary:
The package version was being appended to the version given to `dch`. This
complicated versioning for no good reason. This change collapses the version of
peru, series, and a package version into one unified version that is used with
all the tools (including `dch`).

"There can be only one!"

Reviewers: jacko

Reviewed By: jacko

Differential Revision: https://phabricator.buildinspace.com/D166

scalp42/peru,olson-sean-k/peru,ierceg/peru,oconnor663/peru,enzochiau/peru,nivertech/peru,buildinspace/peru,olson-sean-k/peru,nivertech/peru,buildinspace/peru,ierceg/peru,oconnor663/peru,enzochiau/peru,scalp42/peru