Xpra: Ticket #2537: failed upgrades should preserve sockets

We currently delete the previous server sockets and if the upgrade fails then we are left with no sockets..

Not easy to solve. Options:

Other issues:



Sat, 23 Jan 2021 05:53:57 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2537