Issue #8108: Fix the unwrap() method of SSL objects when the socket has
a non-infinite timeout.  Also make that method friendlier with applications
wanting to continue using the socket in clear-text mode, by disabling
OpenSSL's internal readahead.  Thanks to Darryl Miles for guidance.

Issue #8108: test_ftplib's non-blocking SSL server now has proper handling
of SSL shutdowns.
3 files changed