AO3-6640 Remove config overrides from Rails 5.1 #3291

Job	Run time
rake db:otwseed	1m 17s
rspec spec/controllers	10m 39s
rspec spec/models	5m 39s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	7m 58s
cucumber features/admins	5m 8s
cucumber features/bookmarks	4m 30s
cucumber features/collections	6m 13s
cucumber features/comments_and_kudos	5m 43s
cucumber features/gift_exchanges	6m 18s
cucumber features/importing	2m 28s
cucumber features/other_a	9m 33s
cucumber features/other_b	5m 19s
cucumber features/prompt_memes_a	4m 20s
cucumber features/prompt_memes_b	3m 43s
cucumber features/prompt_memes_c	5m 4s
cucumber features/search	6m 38s
cucumber features/tag_sets	3m 30s
cucumber features/tags_and_wrangling	5m 43s
cucumber features/users	4m 13s
cucumber features/works	15m 52s
	1h 59m 48s

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