Add support to create and convert disk images from existing images

The -i option to vmctl create (eg. vmctl create output.qcow2 -i input.img)
lets you create a new image from an input file and convert it if it is a
different format.  This allows to convert qcow2 images from raw images,
raw from qcow2, or even qcow2 from qcow2 and raw from raw to re-optimize
the disk.

This re-uses Ori's vioqcow2.c from vmd by reaching into it and
compiling it in.  The API has been adjust to be used from both vmctl
and vmd accordingly.

OK mlarkin@

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