Description of problem:

I'm testing OVA file import and it fails without clear info.

IIUC it fails because vdsm does not like return code of v2v ???

...
2018-01-30 12:42:30,228+0100 INFO  (v2v/338b5bd8) [vdsm.api] FINISH teardownImage return=None from=internal, task_id=3d3838df-67d7-462a-8629-b97dcac91f65 (api:52)
2018-01-30 12:42:30,229+0100 ERROR (v2v/338b5bd8) [root] Job u'338b5bd8-324c-43a1-980b-0dfe47d6198b' failed (v2v:866)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/v2v.py", line 861, in _run
    self._import()
  File "/usr/lib/python2.7/site-packages/vdsm/v2v.py", line 886, in _import
    self._proc.returncode))
V2VProcessError: Job u'338b5bd8-324c-43a1-980b-0dfe47d6198b' process failed exit-code: 1
...

some interesting lines before libguestfs stuff closes "convertion"...:

...
# egrep -i '^(guestfs.*|virt-v2v).*(error|warn|fail|no such)' /var/log/vdsm/import/import-338b5bd8-324c-43a1-980b-0dfe47d6198b-20180130T124140.log 
guestfsd: error: /var/lib/dpkg/status: No such file or directory
...

Debian, really?

I used an OVA file found online as example https://virtuallymikebrown.com/2012/02/05/a-small-virtual-machine-for-a-test-lab/#more-678:

curl -o dsl-4-4-10.ova https://virtuallymikebrown.files.wordpress.com/2012/02/dsl-4-4-10.doc

I would expect useful info about failure. I am not also sure why import did run supermin5/qemu if this is just convertion and no "provision" of the image itself is expected to be done.

Version-Release number of selected component (if applicable):
vdsm-4.20.17-1.el7ev.x86_64
virt-v2v-1.36.10-6.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. import this ova file (see above)
2. fails without clear info
3.

Actual results:
it's not clear what's the problem. i can run without any issue vmdk inside ova file via qemu-system-x86_64 -m 512 -hda $image

Expected results:
clear info.

Additional info:
$ tar tvf dsl-4-4-10.ova
-rw-r--r-- VMware/VMware  5142 2012-02-02 10:15 DSL-4.4.10.ovf
-rw-r--r-- VMware/VMware 58358272 2012-02-02 10:15 DSL-4.4.10-disk1.vmdk
-rw-r--r-- VMware/VMware      135 2012-02-02 10:15 DSL-4.4.10.mf

$ qemu-img info DSL-4.4.10-disk1.vmdk 
image: DSL-4.4.10-disk1.vmdk
file format: vmdk
virtual size: 128M (134217728 bytes)
disk size: 56M
cluster_size: 65536
Format specific information:
    cid: 1680580603
    parent cid: 4294967295
    create type: streamOptimized
    extents:
        [0]:
            compressed: true
            virtual size: 134217728
            filename: DSL-4.4.10-disk1.vmdk
            cluster size: 65536
            format: