Verified on this build Red Hat Enterprise Virtualization Hypervisor release 7.0 (20141006.0.el7ev) ovirt-node-3.1.0-0.20.20141006gitc421e04.el7.noarch "Enter a password for the admin user" here in password page.
Fabian, can you please add the relevant doc text?
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/RHEA-2015-0160.html