Backport openstack/blockstorage/extensions/quotasets/

Change-Id: I4ab546714af9bfce738d3d0cfa6f86ed7f889d1d
Related-PROD: PROD-34272
diff --git a/openstack/blockstorage/extensions/quotasets/testing/doc.go b/openstack/blockstorage/extensions/quotasets/testing/doc.go
new file mode 100644
index 0000000..30d864e
--- /dev/null
+++ b/openstack/blockstorage/extensions/quotasets/testing/doc.go
@@ -0,0 +1,2 @@
+// quotasets unit tests
+package testing