Remove uses of --os-url and --os-token

Those were originally used to bootstrap with admin-token from keystone,
but the openstack client is fully configured now, leaving no reason to
not just use the actual users that are there.

Change-Id: I80bdee33a78a97f5d3910aa36dc331f19780d2f1

functions-common

@@ -975,8 +975,6 @@ function get_or_create_endpoint {
 function get_endpoint_url {
     echo $(openstack endpoint list \
             --service $1 --interface $2 \
-            --os-url $KEYSTONE_SERVICE_URI_V3 \
-            --os-identity-api-version=3 \
             -c URL -f value)
 }