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

aggregate coverage metrics of unit tests across packages
diff --git a/openstack/identity/v2/extensions/testing/doc.go b/openstack/identity/v2/extensions/testing/doc.go
index 7603f83..6d4b67d 100644
--- a/openstack/identity/v2/extensions/testing/doc.go
+++ b/openstack/identity/v2/extensions/testing/doc.go
@@ -1 +1,2 @@
+// identity_extensions_v2
 package testing