[style] Fix flake8 warnings.

Trivial style corrections.

nrm/aci.py

@@ -125,6 +125,7 @@ class Container(SpecField):
         """Load container information."""
         return super(Container, self).load(data)
 
+
 class PerfWrapper(SpecField):
 
     """Information on whether to use perf for a container."""
@@ -147,6 +148,7 @@ class PerfWrapper(SpecField):
             return False
         return True
 
+
 class IsolatorList(SpecField):
 
     """Represent the list of isolator in a Manifest."""

nrm/controller.py

@@ -74,7 +74,8 @@ class PowerActuator(object):
         return actions
 
     def execute(self, action):
-        logger.info("changing power limit: %r, %r", action.command, action.delta)
+        logger.info("changing power limit: %r, %r", action.command,
+                    action.delta)
         self.sensor_manager.set_powerlimit(action.target, action.command)
 
     def update(self, action):