Verified. Loaded .../builds/cfme/5.6/stable/cfme-rhevm-5.6.4.2-1.x86_64.qcow2 disk to a RHV-4.0 env, run the CFME appliance, and added a RHV-4.0 provider to it successfully.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2017-0474.html