adding test for Obsolete in rpm spec

According to [The Fedora project's guidelines for renaming/replacing packages](https://fedoraproject.org/wiki/Packaging:Guidelines#Renaming.2FReplacing_Existing_Packages) Obsoletes is the thing to use.
Adding this test causes the tests to fail (for now).
use project#replaces to set the rpm spec's Obsoletes instead of #conflicts

makes tests pass
Merge pull request #384 from b-dean/rpm-replaces

Project replaces fix for rpms