dd-multi: workaround mount/umount issue

It seems that calling umount directly after mount can lead to a
busy error. With strace on umount the problem goes away. It must
be a very small window. Someone should debug the umount syscall
on this. It is reproducable with:

    ./dd-multi.sh lx-trainer.img /dev/sdx

(i.e. regular training image and no layers)

Implement a workaround for this for now.

From the comments...

If there were no layer files added, umount might return a busy
error since we just mounted. (Possibly a kernel bug.) By
accessing the filesytem before unmounting it, the mount/umount
problem seems to go away. Use "ls" to access the filesystem.

Signed-off-by: John Ogness <john.ogness@linutronix.de>

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