test: use smtplib.SMTP[_SSL] timeout = notifications.smtp-timeout

A new option has been added for configuration of SMTP timeout:
- notifications.smtp-timeout

During tests, we can change this timeout to be small, so we aren't
depending on hardware-based RNG to pass the timeout.

Without a timeout, users can run into a long-running test for no
particular reason.

Signed-off-by: Kevin Morris <kevr@0cost.org>
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