Allow user to invalidate his sessions on other devices

[jonatanklosko]

It's been suggested that we implement a "Sign out of other devices" button, as currently achieving this requires resetting password (resetting to the same password has the desired effect, but it's obviously not intuitive). This probably means overriding some Devise methods, but that's something to investigate.

[Nanush7]

Hi Jonatan,
Are you planning to release this feature?

[jonatanklosko]

@Nanush7 I've just created #5542 with a potential implementation.