Set infracloud chocolate to max-servers: 0
Set infracloud chocolate to max-servers: 0

This is prep work for patching in infracloud. It is safest to completely
disable the cloud in nodepool before patching the cloud's controller.

Change-Id: I9b389e4b3c35d118d87b04d1ff9466173ff89fcb

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