Add a nodepool provider for ci.centos.org

This is so nodepool will upload images to the ci.centos.org tenant.
We are not expecting to launch virtual machines with nodepool here.

The credentials have already been added to sfconfig.

Change-Id: I1236e01fe54309d5b59f28be21abe9da1c8695fa

nodepool/nodepool.yaml

@@ -127,3 +127,19 @@ providers:
         username: jenkins
         min-ram: 8192
         config-drive: true
+  # This provider is defined so nodepool can upload images there.
+  # The VMs are created and destroyed by Jenkins on ci.centos.org.
+  - name: rdo-cloud-cico
+    cloud: rdo-cloud-cico
+    max-servers: 0
+    pool: public
+    rate: 0.25
+    networks:
+      - name: private
+    images:
+      - name: rdo-centos-7
+        diskimage: rdo-centos-7
+        name-filter: rdo.m1.nodepool
+        username: jenkins
+        min-ram: 8192
+        config-drive: true