storage: dir: .buildVol and .buildVolFrom callbacks for ploop
These callbacks let us to create ploop volumes in dir, fs and etc. pools. If a ploop volume was created via buildVol callback, then this volume is an empty ploop device with DiskDescriptor.xml. If the volume was created via .buildFrom - then its content is similar to input volume content. Signed-off-by: NOlga Krishtal <okrishtal@virtuozzo.com> Signed-off-by: NJán Tomko <jtomko@redhat.com>
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