linaro-us : set max-servers to 0
This is to clear out the cloud provider before removing.  This is
replaced by the other linaro cloud.
@@ -376,7 +376,7 @@ providers:
config-drive: true
pools:
- name: main
- max-servers: 40
+ max-servers: 0
labels:
- name: centos-9-stream-arm64
flavor-name: 'os.large'
