app/registry: integrate into cluster/kube

This makes a registry be automatically part of the cluster
infrastructure.

Tested by running kubecfg diff, no diffs (apart from out-of-date ACLs)
found.

Change-Id: Ic0635e789cf3fb851f410bcf2865326f1fa87545
diff --git a/cluster/kube/lib/rook.libsonnet b/cluster/kube/lib/rook.libsonnet
index 5223654..512c6a0 100644
--- a/cluster/kube/lib/rook.libsonnet
+++ b/cluster/kube/lib/rook.libsonnet
@@ -491,6 +491,8 @@
 
     ECBlockPool(cluster, name):: {
         local pool = self,
+        name:: name,
+
         spec:: error "spec must be specified",
 
         pool: kube._Object("ceph.rook.io/v1", "CephBlockPool", name) {