[PATCH] Fix keyword expansion in svnmerge_test.py

[Giovanni Bajo <ra...@develer.com>]

Hello,

when svnmerge_test.py was first imported, it got a svn:keywords property. This
screwed up the tests which verify the code to parse keyword strings, as the
keywords being tested with fixed contents were being modified by SVN itself.
This patch makes the tests pass again.

This is my first patch, let me know if I made something wrong wrt conventions
and whatnot.
-- 
Giovanni Bajo