image-info's code which analysed image with multiple partitions was not
correctly working with more than two partitions, which had to be the
root '/' and EFI partition '/boot/efi'. The consequence was that SELinux
labels on paths which were mounted incorrectly could have been reported
as incorrect.
Modify `append_partitions()` to first read the fstab entries and then
mount all partitions using their UUID in the correct order. Only then
analyze the image filesystem tree.
Regenerate affected image test cases.
Signed-off-by: Tomas Hozza <thozza@redhat.com>