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

aggregate coverage metrics of unit tests across packages
diff --git a/openstack/networking/v2/subnets/testing/doc.go b/openstack/networking/v2/subnets/testing/doc.go
index 7603f83..43be31a 100644
--- a/openstack/networking/v2/subnets/testing/doc.go
+++ b/openstack/networking/v2/subnets/testing/doc.go
@@ -1 +1,2 @@
+// networking_subnets_v2
 package testing