aggregate coverage metrics of unit tests across packages (#115)

aggregate coverage metrics of unit tests across packages
diff --git a/openstack/blockstorage/v1/snapshots/testing/doc.go b/openstack/blockstorage/v1/snapshots/testing/doc.go
index 7603f83..85c45f4 100644
--- a/openstack/blockstorage/v1/snapshots/testing/doc.go
+++ b/openstack/blockstorage/v1/snapshots/testing/doc.go
@@ -1 +1,2 @@
+// snapshots_v1
 package testing