[libvirt] testing volDownload and volUpload different md5 on source and dest for qcow2

[Vasiliy Tolstov]

Hi. I'm fix libvirt php binding to properly recv from stream and after
that test volume download and volume upload functions. And see, that
in case of raw image md5sum on src and on dst is equal.
But in case of qcow - phisical size of image is different and md5sum
does not equal.
Why this can happening?

-- 
Vasiliy Tolstov,
e-mail: v.tolstov at selfip.ru