Update bare exceptions to specify Exception.

This will keep us from accidentally catching program-exiting exceptions
like KeyboardInterupt and SystemExit.

test/units/modules/network/netvisor/nvos_module.py

@@ -30,7 +30,7 @@ def load_fixture(name):
 
     try:
         data = json.loads(data)
-    except:
+    except Exception:
         pass
 
     fixture_data[path] = data