Followup comment fix from alt_demo user creation
Followup comment fix from alt_demo user creation

Tweak a code comment based on a review comment from Steve Martinelli in
https://review.openstack.org/#/c/275121/ where the alt_demo user is now
always created.

Change-Id: I9e9a769f601e52c030e9f6953f1746788c24a185

dtroyer/devstack,noironetworks/devstack,group-policy/devstack,dtroyer/devstack,samgoon/devstack,openstack-dev/devstack,bigswitch/devstack,bswartz/devstack,group-policy/devstack,richliu/devstack,dirkmueller/devstack,richliu/devstack,bswartz/devstack,Mahito/devstack,nawawi/openstack,samgoon/devstack,nawawi/openstack,noironetworks/devstack,bigswitch/devstack,Mahito/devstack,dirkmueller/devstack,openstack-dev/devstack