[test] Use cubicweb-file < 2.0.0
From version 2.0.0, cubicweb-file moved to new-style layout (Python
package) but we still expect it to be an old-style cube in CubicWeb's
tests (WebconfigTC in web/test/unittest_webconfig.py).
--- a/requirements/test-web.txt Wed Jun 06 11:56:15 2018 +0200
+++ b/requirements/test-web.txt Mon Jun 18 08:47:03 2018 +0200
@@ -2,5 +2,5 @@
requests
webtest
cubicweb-blog
-cubicweb-file
+cubicweb-file < 2.0.0
cubicweb-tag