Do we need to allow the same user to join a queue multiple times?

[daltonfury42]

Now that auth is here, and we also know the user name of the person who is joining the queue, we can restrict that a person can join the queue only once.

He can join the queue again once he had left the queue. In other words, the same guy can't join the queue and be in the queue twice.

The UI, on going to to join queue page, should handle this. @akashkbaburajan