The commit Travis references is in stable/mitaka. You can see the parts of that commit in my patch's context.
@Travis
The documentation that Sean referenced delineates between "Horizon Settings" (which "All of [its variables] are contained in the HORIZON_CONFIG dictionary.") and "OpenStack Settings" (which "Most of the following settings [including OPENSTACK_KEYSTONE_ADMIN_ROLES] are defined in openstack_dashboard/local/local_settings.py").
@Sean
The commit Travis references is in stable/mitaka. You can see the parts of that commit in my patch's context.
@Travis
The documentation that Sean referenced delineates between "Horizon Settings" (which "All of [its variables] are contained in the HORIZON_CONFIG dictionary.") and "OpenStack Settings" (which "Most of the following settings [including OPENSTACK_ KEYSTONE_ ADMIN_ROLES] are defined in openstack_ dashboard/ local/local_ settings. py").