Avoid debug noise by consumer ack-tracker

[rdhabalia]

Motivation

Consumer Ack-tracker continuously logs below debug-log and flushing without any acking activity.

10:16:44.094 [pulsar-client-io-26-1:org.apache.pulsar.client.impl.PersistentAcknowledgmentsGroupingTracker@153] INFO  org.apache.pulsar.client.impl.PersistentAcknowledgmentsGroupingTracker - [ConsumerBase{subscription='my-subscriber-name', consumerName='3b5d6', topic='persistent://my-property/my-ns/my-topic1'}] Flushing pending acks to broker: last-cumulative-ack: -1:-1:-1 -- individual-acks: []

Modifications

avoid logging if nothing to ack.

[sijie]

run java8 tests
run integration tests

[sijie]

run java8 tests
run integration tests

[sijie]

run java8 tests

[sijie]

run java8 tests

[sijie]

run java8 tests

[rdhabalia]

rerun java8 tests

[rdhabalia]

rerun integration tests
rerun java8 tests