Rename get_or_add_user_role

get_or_add_user_role is specific to adding a role on a project.
Rename it to get_or_add_user_project_role to allow room for adding a
domain specific role function.

Change-Id: I999308098d22be9800578ae67144a3b687fbc3be
diff --git a/lib/glance b/lib/glance
index c5206d4..5bd0b8c 100755
--- a/lib/glance
+++ b/lib/glance
@@ -238,7 +238,7 @@
 
             local glance_swift_user=$(get_or_create_user "glance-swift" \
                 "$SERVICE_PASSWORD" "glance-swift@example.com")
-            get_or_add_user_role "ResellerAdmin" $glance_swift_user $SERVICE_TENANT_NAME
+            get_or_add_user_project_role "ResellerAdmin" $glance_swift_user $SERVICE_TENANT_NAME
         fi
 
         if [[ "$KEYSTONE_CATALOG_BACKEND" = 'sql' ]]; then