Fix Polisher::Git::Pkg#build_srpm making a GET to rubygems.org.
Fix Polisher::Git::Pkg#build_srpm making a GET to rubygems.org.

This spec is heavily stubbed and this fix is less than ideal but providing a path to the Gem.new allows us to not download the .gem file and provide the path to that file.

ManageIQ/polisher,movitto/polisher-1,xw19/polisher