Change config to Python

- Change Configuration format to be python-based.
- move config logic to frappy/config.py
- Add first py-config: cryo_cfg.py
- Adapt test to new expected config format

Change-Id: Iaec484e0e1e21ebbb1e5c74b53be6231329ddf71

test/test_handler.py

@@ -62,6 +62,7 @@ class ServerStub:
 class ModuleTest(Module):
     def __init__(self, updates=None, **opts):
         opts['description'] = ''
+        opts = {p: {'default': val} for p, val in opts.items()}
         super().__init__('mod', logger, opts, ServerStub(updates or {}))