[fix] Fix log-format test in isolated environment

src/zc/buildout/tests/test_all.py

@@ -4006,6 +4006,8 @@ def test_suite():
                     zc.buildout.testing.normalize_egg_py,
                     zc.buildout.testing.not_found,
                     zc.buildout.testing.root_logger_messages,
+                    # Needed for a test that changes log format
+                    (re.compile(r'^(WARNING )+', re.MULTILINE), ''),
                     zc.buildout.testing.adding_find_link,
                     zc.buildout.testing.python27_warning,
                     zc.buildout.testing.python27_warning_2,