#1446 added an "admin" sub command, which coincidentally is a common first argument for policy addition. It exposes a bug in cobra:
openshift admin policy add-user admin anypassword:adduser -n ui-test-project
returns arguments ["anypassword:adduser"] instead of ["admin", "anypassword:adduser"], so it looks like Cobra is getting confused and eating the first arg. Needs to be fixed.