[collectd] [PATCH] exec-plugin with stdout and stderr separated

[Peter Holik]

Hi!

Digitemp sends errors to stderr, but collectd handles stdout and stderr
as the same and reports parsing errors.

My idea is to seperate stdout and stderr.

I also removed the special pipe handling checking for stdin...
because exec plugin will alway have a fd > 2 for pipes !!
(fd 0,1 and 2 (stdin, stdout, stderr) are used by collectd with /dev/null if demonized)

now strings from stderr will be reportet by ERROR

cu Peter
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