Rename shelltest files because Cabal doesn't know how globs work.

Rename shelltest files because Cabal doesn't know how globs work.

While trying to add my shelltest files to the release tarball, I am
informed that the glob syntax within my cabal file is not the same
fifty-year-old glob syntax that everyone else uses. This commit
renames the test files to not contain more than one period, in order
to make Cabal's globbing match them. You are all assholes. A heartfelt
fuck-you for making me do this.