[modules] Re-enable nic module + allow widget states

All callback from a widget into a module (e.g. for retrieving the status
or the criticality state) now get a widget passed. This has the purpose
of allowing a module to store state/widget specific data somewhere. This
way, for instance, it is possible to store the interface name as part of
the widget, thus making it possible to show the status of the correct
interface.

bumblebee/module.py

@@ -36,24 +36,16 @@ class Module(object):
         self._config = config
         self._output = output
 
-    def data(self):
-        pass
-
-    def critical(self):
+    def critical(self, widget):
         return False
 
-    def warning(self):
+    def warning(self, widget):
         return False
 
-    def state(self):
+    def state(self, widget):
         return "default"
 
-    def instance(self):
+    def instance(self, widget):
         return None
 
-    def next(self):
-        return False
-
-
-
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