Use `os role list` instead of `os user role list`

Since `os user role list` is being deprecated, we should start
migrating to `os role list`, which now has the required ability
to list a users role on a project as of v1.0.2 of osc.

Change-Id: I3fa8bf8f1feaac16e1cde5c55b1be00b92eaa5f6
diff --git a/functions-common b/functions-common
index 5bca836..9c4d599 100644
--- a/functions-common
+++ b/functions-common
@@ -919,8 +919,8 @@
 # Usage: get_or_add_user_role <role> <user> <project>
 function get_or_add_user_role {
     # Gets user role id
-    local user_role_id=$(openstack user role list \
-        $2 \
+    local user_role_id=$(openstack role list \
+        --user $2 \
         --project $3 \
         --column "ID" \
         --column "Name" \