PEP 8 clean thanks to auto pep8

gns3server/modules/iou/adapters/adapter.py

@@ -17,6 +17,7 @@
 
 
 class Adapter(object):
+
     """
     Base class for adapters.
 

gns3server/modules/iou/adapters/ethernet_adapter.py

@@ -19,6 +19,7 @@ from .adapter import Adapter
 
 
 class EthernetAdapter(Adapter):
+
     """
     IOU Ethernet adapter.
     """

gns3server/modules/iou/adapters/serial_adapter.py

@@ -19,6 +19,7 @@ from .adapter import Adapter
 
 
 class SerialAdapter(Adapter):
+
     """
     IOU Serial adapter.
     """