py3: whitelist a test caught by the ratchet
Differential Revision: https://phab.mercurial-scm.org/D4547
--- a/contrib/python3-whitelist Wed Sep 12 11:38:46 2018 -0400
+++ b/contrib/python3-whitelist Wed Sep 12 11:39:48 2018 -0400
@@ -247,6 +247,7 @@
test-issue4074.t
test-issue522.t
test-issue586.t
+test-issue5979.t
test-issue612.t
test-issue619.t
test-issue660.t