[sahara doc fix] registering image doc
[sahara doc fix] registering image doc

Change-Id: Ida0c399259e90b31ebe5a6aa9d074d4f3e2ff905
Partial-Bug: 1490687

openstack/sahara,crobby/sahara,zhangjunli177/sahara,crobby/sahara,tellesnobrega/sahara,egafford/sahara,tellesnobrega/sahara,crobby/sahara,zhangjunli177/sahara,egafford/sahara,zhangjunli177/sahara,openstack/sahara