WIP: pressure-vessel: Use a shorter random string for the server socket

Ludovico de Nittis requested to merge wip/shorten_socket into main

The AF_UNIX sockets that are used as rendezvous-point are limited to 108 bytes by the Linux kernel.

In order to be more flexible with the socket directory size, we avoid using the 36 bytes long UUID as the server socket. Instead we randomize a 12 bytes string that saves us 24 bytes, that we can spare for the socket directory, but it is still long enough to prevent a DOS attack.

Edited by Ludovico de Nittis

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