run-tests: remove '+ hg' trick
This was causing me a fair amount of debugging confusion. Let's just
forget it entirely. Updated tests to match.
abort: repository a/.hg not found!
255
requesting all changes
abort: error: Connection refused
255
abort: repository a/.hg not found!
255
abort: destination '../a' already exists
1
abort: repository a/.hg not found!
255
abort: destination 'q' already exists