ensure metronome owns domain dir
ensure metronome owns domain dir

When adding new domains to Yunohost a directory for each newly added domain is created in `/var/lib/metronome` unfortunately since the directory is created with `sudo mkdir` that means `root:root` owns the directory. Metronome will now fail to write to the directory.
YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost