check_tcp: Implement STARTTLS logic (#1282)

[waja]

Right from
https://github.com/monitoring-plugins/monitoring-plugins/pull/1195#issuecomment-33554590:

I noticed is that for straight up SSL services, check_http certificate check
works! Makes me think the check should actually be implemented in check_tcp
for all SSL protocols.

Then once we get there, what prevent us form adding just the required logic
in check_tcp to implement the STARTTLS certificate checks for every other
STARTTLS-cabaple protocol?

-- 
Reply to this email on GitHub:
https://github.com/monitoring-plugins/monitoring-plugins/issues/1282
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