make time calculations timezone independent (and thus more portable) (#1337)

[Sven Nierlein]

How does this make the code more portable? I mean, thats what timezones are
for, if you want UTC, just use UTC either by changing your system to UTC or
by running the plugin with
TZ="UTC" ..../check_http -C ..
Or just set TZ for your monitoring user, i'd say there are way better
solutions than hardcoding UTC in some of the plugins.

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