Ramp limestone up to 50 instances
Ramp limestone up to 50 instances

The dns woes should be corrected and more recently networking and mirror
setups have been rebuilt to correct some problems. Let's ramp up to 50
instances since 10 look good.

Change-Id: If1d21f3083d70326ac0c0e5a9b68182a073aa055

openstack-infra/project-config,openstack-infra/project-config