Cherry-pick for 5073a70 

Out of order security release 

Remove addon_total_contributions task: nobody is using the field it u… …pdates (Not removing the field yet because I don't want to deal with a costly migration right now)

don't show field error on distribution upload step on first load (moz… …illa#5061)

use unlisted review url if any emails sent about unlisted reviews (mo… …zilla#5047)

new uploads for a pending version inherit the nomination date (mozill… …a#4959)

put update_webext_descriptions_all into CELERY_ROUTES (mozilla#4944) 

Merge pull request mozilla#4849 from mozilla/greenkeeper/uglify-js-2.8.6 Update uglify-js to the latest version 🚀

Setup addons-frontend FxA config for stage and prod (mozilla#4890) Fixes mozilla/addons-frontend#2029