dd-multi.sh: add --keep-files

The first couple steps of the dd-multi.sh script is to:

1. make a sparse copy of the original image
2. loop mount the copy
3. unpack the layers to the loop mount
4. create a vmdk of the copy
5. copy the image and vmdk to the usb drives

If many USB drives need to be prepared at once, usually the
dd-multi.sh script will need to be called multiple times (due
to not enough USB-3 ports being available). However, there is
no need for steps 1-4 to run each time.

Add a --keep-files argument that will not delete the copy and vmdk
files on completion. The --keep-files argument also tells the
dd-multi.sh script to look for existing copy and vmdk files. If
they are found, they are used.

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

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