Token per team

[Nagarian]

We want an authentification system per team in order to identify each team in challenge.

Idea:
MUST HAVE

• We want an authenticated endpoint for admin in order to retrieve one token per team
• Generate a token per team (reusable as cookie for instance)
• Generate a ssh private/public key ? If not ask for team to specify one

NICE TO HAVE

• regenerate token per team