Add missing custom label declaration for limestone nodepool config
Add missing custom label declaration for limestone nodepool config

In a6dd6ff720b191eff0b0236f70e3b93c6b8d7f3f we changed the labels in
the provider configuration but we also need to add them here.

There's no need to set a min-ready key for these.

Change-Id: Ib653a493176da5bc64bc4587a2be3d3d8c4e3807

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