Description of problem:

virt-who throw the following exception

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 387, in run
    self._run()
  File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 421, in _run
    self.prepare()
  File "/usr/lib/python2.7/site-packages/virtwho/virt/rhevm/rhevm.py", line 80, in prepare
    self.get_version()
  File "/usr/lib/python2.7/site-packages/virtwho/virt/rhevm/rhevm.py", line 124, in get_version
    major = version.attrib['major']
KeyError: 'major'


Version-Release number of selected component (if applicable):

1.19 from rhel-7-server-satellite-tools-6.2-rpms

How reproducible:

All the time

Steps to Reproduce:
1. update virt-who to latest version from rhel-7-server-satellite-tools-6.2-rpms
2. run it within the following configuration as an example
[rhev-prod-test]
type=rhevm
##server=https://segotl2598.got.volvo.neta:443/ovirt-engine/
server=https://192.168.111.10:443/ovirt-engine/
username=admin@internal
password=RedHat1!
owner=Default_Organization
#owner=1
env=Library
hypervisor_id=hostname
rhsm_hostname=provisioning.sysmgmt.lan
rhsm_username=virtwho
rhsm_password=virtwho
rhsm_prefix=/rhsm
3. get the error

Actual results:

virt-who crash

Expected results:

virt-who reports to Satellite/Customer portal