configurehood: Prevent multiple instances at the same time
This is based on a similar patch from Tim Niemeyer. Signed-off-by:Adrian Schmutzler <freifunk@adrianschmutzler.de> Reviewed-by:
Robert Langhammer <rlanghammer@web.de> Reviewed-by:
Fabian Bläse <fabian@blaese.de>
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