Title: #396: Explicitly remove support of SSLv2
Did not realize merging to Env from default constants was happening in the end
of `_finalize_core()`, moved the checks in config.py accordingly.
Also, for some reason, github shows `root_logger` issue as solved but it's not
- should all `root_logger` appearances be replaces by a module-own logger?
See the full comment at
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