Fixing vcpuCount periodic error.

When vcpu count is not available via the cpu tune, mom will display an error message every 10 sec.

Change-Id: Ie913a68b95f0384dbd573275cd9e70cb6c740ee6
Bug-Url: https://bugzilla.redhat.com/1119775
Signed-off-by: Kobi Ianko <kianku@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/30181
Reviewed-by: Jiří Moskovčák <jmoskovc@redhat.com>
Reviewed-by: Martin Sivák <msivak@redhat.com>
Tested-by: Kobi Ianko <kobi@redhat.com>
Reviewed-by: Adam Litke <alitke@redhat.com>