RHV: Importing KVM Guest fails

Issue

• Importing KVM Virtual Machine with sparse disk to block storage fails:

Traceback (most recent call last):
  File "/usr/libexec/vdsm/kvm2ovirt", line 22, in <module>
    kvm2ovirt.main()
  File "/usr/lib/python2.7/site-packages/vdsm/kvm2ovirt.py", line 257, in main
    handle_volume(con, diskno, src, dst, options)
  File "/usr/lib/python2.7/site-packages/vdsm/kvm2ovirt.py", line 198, in handle_volume
    options.bufsize)
  File "/usr/lib/python2.7/site-packages/vdsm/kvm2ovirt.py", line 161, in download_disk_sparse
    stream.sparseRecvAll(bytesWriteHandler, recvSkipHandler, op)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 6122, in sparseRecvAll
    ret = holeHandler(self, length, opaque)
  File "/usr/lib/python2.7/site-packages/vdsm/kvm2ovirt.py", line 82, in recvSkipHandler
    return os.ftruncate(fd, cur)
OSError: [Errno 22] Invalid argument