Revert changes to the storage, config, status topic settings back to the defaults.

[dtregonning]

On recommendation from Confluent we should revert the docs and code to use the default values for.

> config.storage.topic=__kafka-connect-splunk-task-configs # kafka topic used to persistent connector task configurations
> config.storage.replication.factor=3
> 
> offset.storage.topic=__kafka-connect-splunk-offsets # kafka topic used to persistent task checkpoints
> offset.storage.replication.factor=3
> offset.storage.partitions=25
> 
> status.storage.topic=__kafka-connect-splunk-statuses # kafka topic used to persistent task statuses
> status.storage.replication.factor=3
> status.storage.partitions=5

[dtregonning]

fixed #139