Argh, let the node boot from a volume!

Change-Id: I3614afe2ff82a9286dfec1e75166f09fd1b48fcc
diff --git a/nodepool/nodepool.yaml b/nodepool/nodepool.yaml
index dbdceb4..bbe9328 100644
--- a/nodepool/nodepool.yaml
+++ b/nodepool/nodepool.yaml
@@ -62,5 +62,6 @@
           - name: centos-base
             cloud-image: pp-base-01
             flavor-name: m1.large
+            boot-from-volume: True
     clean-floating-ips: False
     port-cleanup-interval: 0