Ensure parent of target directory exists before copying FAI config space

debian-edu-faiinstall does not check whether the parent of the target directory
/srv/fai/config existed before invoking cp -a on the config space.  Thus if
/srv/fai does no exist cp will copy /usr/share/debian-edu-fai/fai/config to
/srv/fai instead of /srv/fai/config which is not detected until booting a
client via PXE.  Fix this by ensuring the parent directory of
$FAI_CONFIGDIR_REAL exists.
Additionally do not hardcode /srv/fai which ignores that FAI_CONFIGDIR is
configurable.

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