QPep server high availability

[parvit]

Add the possibility of using multiple gateways

[Client-side]

• Setup of a list gateways (with a priority) which will automatically be contacted in the scanarios:
  • An higher priority gateway did not respond
  • Balancing of traffic among the available gateways

[Server-side]

• Setup of a list gateways (with a priority) which will automatically be contacted in the scanarios:
  • Redirect a quic connection to a different qpep server
  • Load balancing-like functionality in case there is none
  • Redundancy in case of lost connection to one server

It would also allow the creation of a hierarchy of the servers so that in an organization all the clients connect to a local server that then redirects to one or different external qpep servers.