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

aggregate coverage metrics of unit tests across packages
diff --git a/openstack/blockstorage/v1/volumes/testing/doc.go b/openstack/blockstorage/v1/volumes/testing/doc.go
index 2f66ba5..088e43c 100644
--- a/openstack/blockstorage/v1/volumes/testing/doc.go
+++ b/openstack/blockstorage/v1/volumes/testing/doc.go
@@ -1,7 +1,9 @@
+// volumes_v1
+package testing
+
 /*
 This is package created is to hold fixtures (which imports testing),
 so that importing volumes package does not inadvertently import testing into production code
 More information here:
 https://github.com/rackspace/gophercloud/issues/473
 */
-package testing