Correct minor Pep8 issues

glances/outputs/glances_bottle.py

@@ -229,7 +229,6 @@ class GlancesBottle(object):
             abort(404, "Cannot get stats (%s)" % str(e))
         return statval
 
-
     def _api_all_limits(self):
         """Glances API RESTFul implementation.
 

glances/plugins/glances_docker.py

@@ -525,6 +525,7 @@ class Plugin(GlancesPlugin):
         else:
             return 'OK'
 
+
 class ThreadDockerGrabber(threading.Thread):
     """
     Specific thread to grab docker stats.