more demo test cases

- added them to cfg/dummy_cfg.py
+ treat enum correctly in SecopClient.setParameterFromString

Change-Id: Ia5b2d8d3a21c3215cb93d90975086eb9995b1543

cfg/dummy_cfg.py

@@ -96,3 +96,15 @@ Mod('cryo',
     pollinterval = Param(export=False),
     value = Param(unit = 'K', test = 'customized value'),
 )
+
+Mod('heatswitch',
+    'frappy_demo.modules.Switch',
+    'Heatswitch for `mf` device',
+    switch_on_time = 5,
+    switch_off_time = 10,
+)
+
+Mod('bool',
+    'frappy_demo.modules.BoolWritable',
+    'boolean writable test',
+)