Fix warnings in doc build
Fix warnings in doc build

Change-Id: I405cac1e5e1a21c9b5d4292550afc917e225eb46

0xf2/stackalytics,0xf2/stackalytics,stackforge/stackalytics,openstack/stackalytics,0xf2/stackalytics,openstack/stackalytics,stackforge/stackalytics,openstack/stackalytics,openstack/stackalytics,stackforge/stackalytics,0xf2/stackalytics