#11910: change import_fresh_module to return None when one of the "fresh" modules can not be imported.

Dickinson.

OpenSSL is now compiled with OPENSSL_NO_SSL2 defined (without the SSLv2
protocol) on Debian: fix the ssl module on Debian Testing and Debian Sid.

Optimize also ssl.get_protocol_name(): speed does matter!

I don't think that we still need it.

instead of a nul byte into the wakeup file descriptor. So it is possible to
wait more than one signal and know which signals were raised.

signal module.

test_ftplib.py: change client default timeout from 10 to 2. Hanging for 10 seconds is way too much when we expect a server response which never comes in.