Updated openstack/openstack
Project: openstack-infra/devstack-gate  b35a6728743976657b3fa1bc2c9b69602f10b530

Switched documentation to point to storyboard.

We've migrated this project to storyboard, I'm updating the
documentation links.

Change-Id: If61b1ad373079caaf0c4dcb2d96e4420e3f2dc8a