diod: keep --foreground option for compatibility #134
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Commit 3dc9363 ("diod: always run in the foreground") did what it says on the tin and removed the functionality to daemonize. The old --foreground option that disabled daemonization was also removed.
The breaks existing setups that were using foreground execution all along via passing --foreground: The option no longer exists and instead the full usage test is printed.
As not to break existing setups, let's keep the --foreground option around for now and just make it a no-op, given that it became the default behavior.