check_by_ssh: added option to exit with an warning, if there is output on STDERR (#1301)

[jklippel]

While it is a good idea to centralize matching functionality I am opposed to
replacing this small patch by an negate-enhancement.
- The size of this patch (i12:d2) alone does not justify the effort to
enhance negate by such a big feature..
- There is already the --skip-stderr parameter, the proposed patch only
extends the already existing behaviour by issuing a warning.
- Using negate would introduce at least one additional fork which is not
helpful in a big environment using check_by_ssh very often and a lot of
overhead for so little functionality.

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