move unit tests into 'testing' directories
diff --git a/openstack/compute/v2/extensions/startstop/testing/doc.go b/openstack/compute/v2/extensions/startstop/testing/doc.go
new file mode 100644
index 0000000..7603f83
--- /dev/null
+++ b/openstack/compute/v2/extensions/startstop/testing/doc.go
@@ -0,0 +1 @@
+package testing