[PATCH] tests: stabilize svn output

[timeless]

That failure is from:
changeset:   30149:d64fc4db7f44
user:        Anton Shestakov <av6 at dwimlabs.net>
date:        Fri Mar 11 22:30:04 2016 +0800
summary:     convert: specify unit for ui.progress when scanning paths

he didn't update the tests properly and apparently the systems (like
my gcc112 until recently) didn't have enough svn to notice. not
surprising, setting up svn is not easy (no pip install available).