AO3-6640 Remove config overrides from Rails 5.1 #3576

Job	Run time
rake db:otwseed	1m 8s
rspec spec/controllers	11m 16s
rspec spec/models	5m 24s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	7m 31s
cucumber features/admins	4m 41s
cucumber features/bookmarks	4m 30s
cucumber features/collections	5m 57s
cucumber features/comments_and_kudos	5m 40s
cucumber features/gift_exchanges	6m 47s
cucumber features/importing	2m 52s
cucumber features/other_a	10m 3s
cucumber features/other_b	5m 15s
cucumber features/prompt_memes_a	3m 47s
cucumber features/prompt_memes_b	3m 24s
cucumber features/prompt_memes_c	4m 47s
cucumber features/search	6m 27s
cucumber features/tag_sets	2m 51s
cucumber features/tags_and_wrangling	6m 9s
cucumber features/users	4m 35s
cucumber features/works	13m 44s
	1h 56m 48s

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