API Change Tutorial doc code modify
API Change Tutorial doc code modify

The refactor of code cause the inappropriate guide.
Code in tutorial is out of date.

Change-Id: Ic986af1072f158f0f0f5608a9754db9d3e507409
Closes-Bug: #1597196

cernops/keystone,rajalokan/keystone,rajalokan/keystone,rajalokan/keystone,ilay09/keystone,ilay09/keystone,openstack/keystone,mahak/keystone,mahak/keystone,cernops/keystone,mahak/keystone,ilay09/keystone,openstack/keystone,openstack/keystone