Review Request 21173: Fix KAFKA-1432: follow-up on using new producer on system test MMs

[Guozhang Wang]

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Review request for kafka.


Bugs: KAFKA-1432
    https://issues.apache.org/jira/browse/KAFKA-1432


Repository: kafka


Description
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Add --new.producer in system tests


Diffs
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  system_test/utils/kafka_system_test_utils.py 
6917ea1d0c79b993b3208510a920484e9323aa5c 

Diff: https://reviews.apache.org/r/21173/diff/


Testing
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Thanks,

Guozhang Wang