Revert "Remove redis config file"
Revert "Remove redis config file"

This reverts commit c9e938a703bf413f8bd4aa460683b7bdcf1afaef.

This file isn't used by Whitehall but is required to hookup the Sidekiq
monitoring.

alphagov/whitehall,alphagov/whitehall,alphagov/whitehall,alphagov/whitehall