Liang Hong

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![image](https://user-images.githubusercontent.com/231336/35380450-3c31b520-01f4-11e8-8dfa-bb045226b11a.png) 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.

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