[controller] add cluster name to the 'Venice-Admin-Execution-Task' th… (#684)

[controller] add cluster name to the 'Venice-Admin-Execution-Task' threads

In controller, each cluster has one corresponding AdminConsumptionTask and
multiple 'Venice-Admin-Execution-Task' to consume the admin messages and
then execute the admin operations. Today, it is not easy to differentiate
which cluster one execution task belongs to, if one analyze controller logs
or Java heap dump. This change appends the cluster name to the existing
thread name prefix to make it distinguishable.

Author: lluwm

services/venice-controller/src/main/java/com/linkedin/venice/controller/kafka/consumer/AdminConsumptionTask.java

@@ -291,7 +291,7 @@ public AdminConsumptionTask(
         60,
         TimeUnit.SECONDS,
         new LinkedBlockingQueue<>(MAX_WORKER_QUEUE_SIZE),
-        new DaemonThreadFactory("Venice-Admin-Execution-Task"));
+        new DaemonThreadFactory(String.format("Venice-Admin-Execution-Task-%s", clusterName)));
     this.undelegatedRecords = new LinkedList<>();
     this.stats.setAdminConsumptionFailedOffset(failingOffset);
     this.pubSubTopicRepository = pubSubTopicRepository;