out_kafka: disable use of opaque data in delivery callback (#2065)
out_kafka: disable use of opaque data in delivery callback (#2065)

Our delivery message callback is not getting the proper opaque data
set in the producer, to identify the root cause of the issue we have
opened a ticket with librdkafka team:

  https://github.com/edenhill/librdkafka/issues/2789

For now this patch will disable the need of the opaque data type.

Signed-off-by: Eduardo Silva <81f705dc2ce1a61a2621e0e4b442a9474e1d0c70@treasure-data.com>

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