Dynamic imports of drivers classes.

Change-Id: I10274bf9bada30f0fbd4ed27f367454c09dad5c2

kwapi/drivers/__init__.py

@@ -1,18 +0,0 @@
-# -*- coding: utf-8 -*-
-#
-# Author: François Rossigneux <francois.rossigneux@inria.fr>
-#
-# Licensed under the Apache License, Version 2.0 (the "License"); you may
-# not use this file except in compliance with the License. You may obtain
-# a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-
-from wattsup import Wattsup
-from dummy import Dummy

kwapi/drivers/driver_manager.py

@@ -17,7 +17,6 @@
 """Loads and checks driver threads."""
 
 import ast
-import sys
 import signal
 import thread
 from threading import Timer
@@ -61,17 +60,19 @@ def load_all_drivers():
 def load_driver(class_name, probe_ids, kwargs):
     """Starts a probe thread."""
     try:
-        probeClass = getattr(sys.modules['kwapi.drivers'], class_name)
-    except AttributeError:
+        module = __import__('kwapi.drivers.' + class_name.lower(),
+                            fromlist=class_name)
+        probe_class = getattr(module, class_name)
+    except ImportError:
         raise NameError("%s doesn't exist." % class_name)
     try:
-        probeObject = probeClass(probe_ids, **kwargs)
+        probe_object = probe_class(probe_ids, **kwargs)
     except Exception as exception:
         LOG.error('Exception occurred while initializing %s(%s, %s): %s'
                   % (class_name, probe_ids, kwargs, exception))
     else:
-        probeObject.start()
-        return probeObject
+        probe_object.start()
+        return probe_object
 
 
 def check_drivers_alive():