Xpra: Ticket #1631: uinput device permissions

Follow up from #1611.

We want to be able to continue to use uinput when upgrading a server.

The patch attached almost kinda works, with some problems:

Sat, 02 Sep 2017 10:41:03 GMT - Antoine Martin: attachment set

work in progress patch

Sat, 02 Sep 2017 17:36:29 GMT - Antoine Martin: status, description changed; resolution set

Done in r16777:

Sat, 23 Jan 2021 05:29:35 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1631