datatypes.tests needs __init__.py to be a module

Signed-off-by: martin f. krafft <madduck@madduck.net>
diff --git a/reclass/datatypes/tests/__init__.py b/reclass/datatypes/tests/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/reclass/datatypes/tests/__init__.py