gluon-config-mode-core: discard gluon-reconfigure output #2395
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The stdout output of gluon-web scripts is directly sent to uhttpd,
becoming a part of the HTML output or even replacing HTTP status or
headers. The output of gluon-reconfigure is not supposed to end up
there.
While we're at it, also add an exec to avoid an unnecessary shell
process.
Extracted from #2372, as we'll also want to backport this commit to v2021.1.x as soon as possible.