Description of problem:
run VM test fail on ovirt system tests in CI

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


How reproducible:
always


Steps to Reproduce:
1.run ovirt system tests on master branch
2.wait for 004_basic_sanity.vm_run test
3.see failure

Actual results:


Expected results:
As long we we run on 7.2 hosts, tests shouldn't fail on any 7.3 features,
until Centos 7.3 is out. (if this is required for the test to run)


Additional info:

from vdsm.log:

2016-12-02 04:31:12,527-05 DEBUG
[org.ovirt.engine.core.vdsbroker.monitoring.EventVmStatsRefresher]
(ForkJoinPool-1-worker-4) [83b6b5d] processing event for host
lago-basic-suite-master-host0 data:
39710f89-9fa2-423e-9fa8-1448ca51f166:
status = Down
timeOffset = 0
exitReason = 1
exitMessage = XML error: file '/dev/urandom' is not a supported random source
exitCode = 1

and here is the vdsm log:

2016-12-02 04:31:10,618 ERROR (vm/39710f89) [virt.vm]
(vmId='39710f89-9fa2-423e-9fa8-1448ca51f166') The vm start process
failed (vm:613)
Traceback (most recent call last):
  File "/usr/share/vdsm/virt/vm.py", line 549, in _startUnderlyingVm
    self._run()
  File "/usr/share/vdsm/virt/vm.py", line 1980, in _run
    self._connection.createXML(domxml, flags),
  File "/usr/lib/python2.7/site-packages/vdsm/libvirtconnection.py",
line 128, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/utils.py", line 936, in wrapper
    return func(inst, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3611, in createXML
    if ret is None:raise libvirtError('virDomainCreateXML() failed', conn=self)
libvirtError: XML error: file '/dev/urandom' is not a supported random source

Full logs can be found on the job:
http://jenkins.ovirt.org/job/test-repo_ovirt_experimental_master/3816/

Specifically engine log:
http://jenkins.ovirt.org/job/test-repo_ovirt_experimental_master/3816/artifact/exported-artifacts/basic_suite_master.sh-el7/exported-artifacts/test_logs/basic-suite-master/post-002_bootstrap.py/lago-basic-suite-master-engine/_var_log_ovirt-engine/engine.log

host 0 vdsm log:
http://jenkins.ovirt.org/job/test-repo_ovirt_experimental_master/3816/artifact/exported-artifacts/basic_suite_master.sh-el7/exported-artifacts/test_logs/basic-suite-master/post-002_bootstrap.py/lago-basic-suite-master-host0/_var_log_vdsm/vdsm.log


host 1 vdsm log:
http://jenkins.ovirt.org/job/test-repo_ovirt_experimental_master/3816/artifact/exported-artifacts/basic_suite_master.sh-el7/exported-artifacts/test_logs/basic-suite-master/post-002_bootstrap.py/lago-basic-suite-master-host1/_var_log_vdsm/vdsm.log