P2P communications should be extended

[lodygens]

Up to now it is possible to start a new job that has several listening ports (aka a VM running sshd and apache) accessible through P2P communications mechanisms.
It is also possible to start a new job that will connect to a port behind a firewall with the same P2P mechanisms. Unfortunately, we can only set a single outgoing communication channel.
We should enable multi outgoing channels on job side.