e8d1546 Fix for libvirt >= 6.0

Authored and Committed by frantisekz 4 years ago
    Fix for libvirt >= 6.0
    
    It seems libvirt >= 6.0 requires to specify "-f qcow2 -F qcow2" in qemu-img.
    
    Reference: https://libvirt.org/kbase/backing_chains.html#manual-image-creation
    
        
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