Add support for qcow2 disk format, enabled by imageio NBD backend in RHV 4.3.
 To use this feature manually, you can run virt-v2v with "-of qcow2".
 Here is example run:
 Source disk:
 $ qemu-img info /var/tmp/fedora-30.img
 image: /var/tmp/fedora-30.img
 file format: raw
 virtual size: 6 GiB (6442450944 bytes)
 disk size: 1.15 GiB
 virt-v2v:
 $ ./run virt-v2v \
     -v \
     -i disk /var/tmp/fedora-30.img \
     -o rhv-upload \
     -oc 
https://engine/ovirt-engine/api \
     -op /var/tmp/engine-password \
     -on v2v \
     -os nfs1-export2 \
     -of qcow2 \
     -oa sparse \
     -oo rhv-cafile=/etc/pki/vdsm/certs/cacert.pem \
     -oo rhv-cluster=fc30 \
     -oo rhv-direct=true
 ...
 [  71.2] Copying disk 1/1 to qemu URI json:{ "file.driver": "nbd",
"file.path":
"/home/nsoffer/src/virt-v2v/tmp/rhvupload.6EmoNE/nbdkit0.sock",
"file.export": "/" } (qcow2)
              overlay file: /home/nsoffer/src/virt-v2v/tmp/v2vovl7fefa6.qcow2
       overlay device name: sda
 overlay virtual disk size: 6442450944
   overlay source qemu URI: /var/tmp/fedora-30.img
     target estimated size: 2456662831
        target actual size: None
           target file: [qemu] json:{ "file.driver": "nbd",
"file.path":
"/home/nsoffer/src/virt-v2v/tmp/rhvupload.6EmoNE/nbdkit0.sock",
"file.export": "/" }
         target format: qcow2
 ...
 qemu-img 'convert' '-p' '-n' '-f' 'qcow2'
'-O' 'raw' '-S' '64k'
'/home/nsoffer/src/virt-v2v/tmp/v2vovl7fefa6.qcow2' 'json:{
"file.driver": "nbd", "file.path":
"/home/nsoffer/src/virt-v2v/tmp/rhvupload.6EmoNE/nbdkit0.sock",
"file.export": "/" }'
 ...
 Target disk:
 $ qemu-img info
/rhev/data-center/82a445b6-b5e0-43c3-b761-cc6ef972e163/55255570-983a-4d82-907a-19b964abf7ed/images/f5325b5a-22e4-4a80-ad15-f68378c42dde/ab4587de-3ddf-4178-8cc0-1a09449c970d
 image:
/rhev/data-center/82a445b6-b5e0-43c3-b761-cc6ef972e163/55255570-983a-4d82-907a-19b964abf7ed/images/f5325b5a-22e4-4a80-ad15-f68378c42dde/ab4587de-3ddf-4178-8cc0-1a09449c970d
 file format: qcow2
 virtual size: 6 GiB (6442450944 bytes)
 disk size: 1.17 GiB
 cluster_size: 65536
 Format specific information:
     compat: 1.1
     lazy refcounts: false
     refcount bits: 16
     corrupt: false
 Nir Soffer (3):
   rhv-upload: Log params for easier debugging
   v2v: Add output#tranfer_format method
   rhv-upload: Support qcow2 disk format
  v2v/output_rhv_upload.ml |  7 ++++---
  v2v/rhv-upload-plugin.py | 20 ++++++++++++++++++++
  v2v/types.ml             |  1 +
  v2v/types.mli            |  4 ++++
  v2v/v2v.ml               |  2 +-
  5 files changed, 30 insertions(+), 4 deletions(-)
 --
 2.21.0