Added session killer artisan command

[snipe]

Simple artisan command to logout all users - especially useful when using the restore command. If you restore without killing all sessions, and your user ID isn't the same, your session will persist, and you could be logged in as someone else. (This is why we destroy sessions in v6 on the GUI restore.)

Using the --force flag will override confirmation prompts, in the event we want to use this non-interactively.

Signed-off-by: snipe snipe@snipe.net

[uberbrady]

Yup! This is great. And if we eventually do get to a point where we need a version of this for other session stores, I think this will be the right vehicle to do it. In the UI-backed restore, we should probably invoke this command as well, yeah?