After upgrading RHV-H 4.0, ovirt-imageio-daemon failed to start

Issue

• After upgrading RHV-H hypervisor to version 4.0 (20170201), service ovirt-imageio-daemon fails to start.

• In the Events tab in RHV Manager the following message is reported:

  VDSM HOST command failed: Cannot communicate with image daemon: 'reason=Error communicating with ovirt-imageio-daemon: [Errno 2] No such file or directory'
  

• Adding a new host in the RHV environment fails with the following error messages in the logs:

  # less /var/log/ovirt-engine/host-deploy/ovirt-host-deploy.log
  
  DEBUG otopi.plugins.otopi.services.systemd plugin.execute:926 execute-output: ('/bin/systemctl', 'start', 'ovirt-imageio-daemon.service') stderr:
  Job for ovirt-imageio-daemon.service failed because the control process exited with error code. See "systemctl status ovirt-imageio-daemon.service" and "journalctl -xe" for details.
  
  DEBUG otopi.context context._executeMethod:142 method exception
  Traceback (most recent call last):
    File "/tmp/ovirt-8uSsQnoVJ1/pythonlib/otopi/context.py", line 132, in _executeMethod method['method']()
    File "/tmp/ovirt-8uSsQnoVJ1/otopi-plugins/ovirt-host-deploy/vdsm/packages.py", line 180, in _start self.services.state('ovirt-imageio-daemon', True)
    File "/tmp/ovirt-8uSsQnoVJ1/otopi-plugins/otopi/services/systemd.py", line 141, in state service=name,
  RuntimeError: Failed to start service 'ovirt-imageio-daemon'