Don't tolerate unready endpoints in cockroachdb example

That was only included in the initial config due to cargo-culting, and
has the potential to break node startup if it resolves its own address
to gossip to.

examples/cockroachdb/cockroachdb-petset.yaml

@@ -24,8 +24,6 @@ apiVersion: v1
 kind: Service
 metadata:
   annotations:
-    # Make sure DNS is resolvable during initialization.
-    service.alpha.kubernetes.io/tolerate-unready-endpoints: "true"
     # Enable automatic monitoring of all instances when Prometheus is running in the cluster.
     prometheus.io/scrape: "true"
     prometheus.io/path: "_status/vars"