check_load hardcodes path to 'uptime' (#1394)

[waja]

@hydrapolic as being in up- and downstream of monitoring-plugins, in either
way I want to ensure I define and detect the capabilities of external tools
on compile time and have a defined environment on runtime. When using
external tools that might change (in behaviour, location, what else), that
can cause troubles.
When using the first binary found in path, that can be cause more trouble
more easier. All this stuff should be handled by distribution toolstack.

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