f6ec6af qemu: don't call virFileExists() for network type disks

Authored and Committed by mkletzan 9 years ago
    qemu: don't call virFileExists() for network type disks
    
    Based on suggestion from Eric [1], because it might not get cleaned up
    before the release, so to avoid potential errors.
    
    [1] https://www.redhat.com/archives/libvir-list/2014-April/msg00929.html
    
    Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
    
        
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