nodeinfodata: Remove broken symlinks and uneeded files
    
    The 7c3c7f217ebae5 and f5c2d6 commits introduced a nodeinfo test.
    In order to do that, some parts of sysfs had to be copied.
    However, sysfs is full of symlinks, so during copying some
    symlinks broke. Remove them, as on different systems they can
    point to different files or be broken. At the same time, we don't
    need all files added in those commits. For instance we don't care
    about 'uevent' files, 'power' folders, and others.
    
    Signed-off-by: Michal Privoznik <mprivozn@redhat.com>