Disable citycloud-lon1 region in nodepool
We've been seeing a large number of jobs timeout in this region.
Looking at logstash, it appears we may have some misbehaving compute
nodes our VMs run on.  Both nodes and mirror have been experiencing
bad IO issues.
@@ -845,7 +845,7 @@ providers:
cloud: citycloud
api-timeout: 60
boot-timeout: 120
- max-servers: 50
+ max-servers: 0
rate: 0.25
image-type: 'qcow2'
template-hostname: '{image.name}-{timestamp}'
