tests: fix test-subrepo-paths.t on Python 3...
tests: fix test-subrepo-paths.t on Python 3
The Python 3 group reference error message is a little more helpful,
so we'll allow the extra output. I tried matching this with an (re)
line, but decided it wasn't worth the effort.
Differential Revision:
https://phab.mercurial-scm.org/D3623