From users mailing list:
I had a cluster composed by two nodes, plain CentOS 7.3 nodes.
They were installed in 4.0.6 (on 21/01) and this involved installation of libcacard-ev-2.3.0-31.el7.16.1.x86_64 package.
Then I updated to 4.1 (on 08/02) using "yum update" strategy and nothing changed about this package.
Yesteray I added a third node, but I notice that on it I don't have libcacard-ev but libcacard-2.5.2-2.el7.x86_64

Source for the -ev package is qemu-kvm-ev-2.3.0-31.el7.16.1.src.rpm and build host el7-vm28.phx.ovirt.org and this makes me think it is the right package.
But it is not pulled in into the new host where I think I have the standard CentOS one with source RPM libcacard-2.5.2-2.el7.src.rpm and Packager CentOS BuildSystem 
 
The strange thing is that in their changelog I have:

- for standard libcacard:
* Fri Mar 18 2016 Miroslav Rezanina <mrezanin> - 2.5.2-2.el7
- Obsolete libcacard-rhev (bz#1315953)

* Fri Jan 29 2016 Miroslav Rezanina <mrezanin> - 2.5.2-1.el7
- Initial build

- for libcacard-ev
* Fri Jul 08 2016 Sandro Bonazzola <sbonazzo> - ev-2.3.0-31.el7_2.16.1
- Removing RH branding from package name

* Thu Jun 16 2016 Miroslav Rezanina <mrezanin> - rhev-2.3.0-31.el7_2.16
- kvm-vga-add-sr_vbe-register-set.patch [bz#1347185]
- Resolves: bz#1347185
  (Regression from CVE-2016-3712: windows installer fails to start)


Solution here is to rebuild 2.5.2 adding an Obsolete on libcacard-ev