AO3-6706 Support Sentinel config for Redis clients #3960

Job	Run time
rake db:otwseed	1m 24s
rspec spec/controllers	11m 6s
rspec spec/models	5m 44s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	7m 54s
cucumber features/admins	4m 44s
cucumber features/bookmarks	5m 27s
cucumber features/collections	6m 19s
cucumber features/comments_and_kudos	6m 31s
cucumber features/gift_exchanges	6m 32s
cucumber features/importing	2m 53s
cucumber features/other_a	10m 41s
cucumber features/other_b	7m 8s
cucumber features/prompt_memes_a	4m 27s
cucumber features/prompt_memes_b	4m 25s
cucumber features/prompt_memes_c	5m 8s
cucumber features/search	5m 48s
cucumber features/tag_sets	3m 23s
cucumber features/tags_and_wrangling	5m 50s
cucumber features/users	4m 42s
cucumber features/works	12m 30s
	2h 2m 36s

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