Description of problem:
The "unknown" user in who and last command appears when running in graphical.target mode. It does not appear when running in multi-user.target mode

Version-Release number of selected component (if applicable):
gdm-3.14.2-12.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. ssh in when no user is logged into the console
2. run 'who -u'
3. run last 

Actual results:
# who -u
(unknown) :0           2016-11-01 15:28   ?          1710 (:0)
root     pts/0        2016-11-02 21:48   .         15132 (10.76.0.219)

Expected results:
# who -u
root     pts/0        2016-11-02 21:48   .         15132 (10.76.0.219)

Additional info:
Upstream bug: https://bugzilla.redhat.com/show_bug.cgi?id=760834

Code is here:
-------------
        if (user_name != NULL) {•
                username = user_name;•
        } else {•
                username = "(unknown)";•
        }•
-------------