This requires a puppet apply on prod, as well as manually
updating the symlinks of Zulip-latest and Humbug-latest on
prod0
(imported from commit c5ef8cd0e2d156144531b35af9a8c5226f5bf750)
This requires a puppet apply, and also a manual update of
the Zulip-latest.* symlinks in /srv/www/dist/apps
(imported from commit 991dd6924ba33d81f486e914bcbadfec5b350660)