Description of problem:

When trying to select VM for the import it fails with message
~~~
All chosen VMs couldn't be retrieved by the external system and therefore have been filtered. Please see log for details.
~~~
engine.log
~~~
2017-08-22 08:09:03,750-04 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.GetVmsFullInfoFromExternalProviderVDSCommand] (default task-130) [65ff9fb2-25e4-44a2-90fd-cb5a55e17e02] START, GetVmsFullInfoFromExternalProviderVDSCommand(HostName = rhvhsrv03, GetVmsFromExternalProviderParameters:{runAsync='true', hostId='3c4e0144-c1be-4bad-8737-dfa749a86f1f', 
url='vpx://XXXXXX?no_verify=1', username='root', originType='VMWARE', namesOfVms='[rh73-clone]'}), log id: 6ab41bac
2017-08-22 08:09:05,315-04 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.GetVmsFullInfoFromExternalProviderVDSCommand] (default task-130) [65ff9fb2-25e4-44
a2-90fd-cb5a55e17e02] FINISH, GetVmsFullInfoFromExternalProviderVDSCommand, return: [], log id: 6ab41bac
~~~
vdsm.log 
~~~
2017-08-22 08:10:23,255-0400 ERROR (jsonrpc/5) [root] Error getting disk size (v2v:1089)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/v2v.py", line 1081, in _get_disk_info
    vol = vm.blockInfo(disk['alias'])
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 694, in blockInfo
    if ret is None: raise libvirtError ('virDomainGetBlockInfo() failed', dom=self)
libvirtError: this function is not supported by the connection driver: virDomainGetBlockInfo
2017-08-22 08:10:23,255-0400 WARN  (jsonrpc/5) [root] Cannot add VM rh73-clone due to disk storage error (v2v:1020)
~~~

Version-Release number of selected component (if applicable):
libvirt-3.2.0-14.el7_4.2.x86_64
RHV 4.1.4
ESX 6.0

Steps to Reproduce:
1. Import VM - select 
2. All chosen VMs couldn't be retrieved 


Actual results:
libvirtError: this function is not supported by the connection driver: virDomainGetBlockInfo

Expected results:
The VM passed the test