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
diff --git a/functions-common b/functions-common
index e8f8b10..8a08731 100644
--- a/functions-common
+++ b/functions-common
@@ -975,8 +975,6 @@
 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)
 }