Add unit test for issue #682 fixed in PR #728, which does not contain
the test of its own.
The test creates a fake SSL server, inherited from SSLServer, which
does not create an SSL context. When an SSL client attempts to send it
a request, it gets a timeout error. Prior to PR #728, the client would
wait indefinitely
Co-authored-by: Michael Tseitlin <michael.tseitlin@concertio.com>
SSL connection is performed in two steps:
First, a regular socket connection is established.
Then, SSL_connect/SSL_accept is called to establish SSL handshake.
If a network problem occurs during the second stage, SSL_connect on
the client may hang indefinitely.
The non-blocking mode solves this problem.
Co-authored-by: Michael Tseitlin <michael.tseitlin@concertio.com>
