Clean imports in code

In some part in the code we import objects. In the Openstack style
guidelines they recommend to import only modules.

http://docs.openstack.org/developer/hacking/#imports

Change-Id: Ib9ad9ecfc1aabd36700a3f2ce913f611ac3811c2

manila_ui/dashboards/project/config.py

@@ -23,9 +23,9 @@
 # configuration label and avoid this conflict.
 #
 
-from django.apps import AppConfig
+from django import apps
 
 
-class Config(AppConfig):
+class Config(apps.AppConfig):
     name = 'manila_ui.dashboards.project'
     label = 'manila_project'