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

aggregate coverage metrics of unit tests across packages
diff --git a/openstack/identity/v3/services/testing/doc.go b/openstack/identity/v3/services/testing/doc.go
index 7603f83..e4f1167 100644
--- a/openstack/identity/v3/services/testing/doc.go
+++ b/openstack/identity/v3/services/testing/doc.go
@@ -1 +1,2 @@
+// identity_services_v3
 package testing