tests: glob out exception type for directory collision
Got three different results on buildbot.
--- a/tests/test-merge1.t Thu Jul 25 02:34:09 2013 -0500
+++ b/tests/test-merge1.t Thu Jul 25 02:44:27 2013 -0500
@@ -28,7 +28,7 @@
$ mkdir b
$ hg up
- abort: Is a directory: '$TESTTMP/t/b'
+ abort: *: '$TESTTMP/t/b' (glob)
[255]
$ hg ci
abort: last update was interrupted