Revert "Revert "Revert "Revert "Temporarily stop booting nodes in inap-mtl01""""

This reverts commit fa9e37d729.

Still seeing a significant percentage of nodes becoming
unreachable/broken during builds, turn it back off again while we
dig deeper in service logs.

Change-Id: Ib0ba945e91956cb76504893bd9924d4b70d4ffb6

nodepool/nl03.openstack.org.yaml

@@ -106,7 +106,7 @@ providers:
         config-drive: true
     pools:
       - name: main
-        max-servers: 95
+        max-servers: 0
         labels:
           - name: centos-7
             min-ram: 8000