Bump max-servers to 10 on datacentred region
Bump max-servers to 10 on datacentred region

A mirror has been set up and images built, let's try to use this.

Change-Id: Id0cfb2979eb79b5b332806b453b07e3e8a909d55

Tesora/tesora-project-config,Tesora/tesora-project-config,openstack-infra/project-config,openstack-infra/project-config