remove untilConcludes workaround?

[Antoine Martin]

Since we've dropped support for python versions older than 3.6 (#2290), the ​socket.recv says: Changed in version 3.5: If the system call is interrupted and the signal handler does not raise an exception, the method now retries the system call instead of raising an InterruptedError exception

[Antoine Martin]

r25222 removes the EINTR / EWOULDBLOCK part of the workaround.

Still TODO:

• remove set_continue_wait? (win32 shadow servers can use regular socket timeouts)
• do we still need the ssl code string workaround with python3?

[Antoine Martin]

Updates:

• r25230 removes continue_wait
• r25231 removes ssl code string
• r25233 + r25234 better ssl debug
• r25235 reverts parts of r25233: we can't set ssl sockets to blocking mode on win32

This will do for now.

[migration script]

this ticket has been moved to: ​https://github.com/Xpra-org/xpra/issues/2591