pass role by name not id
pass role by name not id

Change-Id: Ie67758bed3563c9a46a5180eaa9c8d47721fffd8

openstack-dev/devstack,richliu/devstack,dtroyer/devstack,openstack-dev/devstack,group-policy/devstack,group-policy/devstack,noironetworks/devstack,nawawi/openstack,nawawi/openstack,noironetworks/devstack,richliu/devstack,dtroyer/devstack