Add support for unlocking users in admin settings
What does this MR do?
This MR gives the ability to unlock a user from the Admin panel.
Why was this MR needed?
If a user fails to login a certain number of times, Devise locks the user out for a certain amount of time (e.g. 10 minutes). There is no way for an admin to unlock a user if this happens (aside from editing the locked_at field entirely).
Screenshots
Admin index page
Admin edit user page
What are the relevant issue numbers?
This replaces !288 (closed).