[KAFKA-6482] when produce send a invalidity timestamps, broker will be not delete …

[leonhong]

when produce send a invalidity timestamps, broker will be not delete files forever...

https://issues.apache.org/jira/browse/KAFKA-6482

[leonhong]

data retention is 48 hours, but logs.dir exist 5 days's datas. because produce send 's timestamp is 'feature time', the timestamp is invalidity.

[leonhong]

when producer set timestamp's unit is Microsecond. but broker retention's timestamp is Millisecond. broker will be judge error, 'config.retentionMs' will be lose efficacy. @hachikuji

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