RFR:JDK-8148849:Truncating Duration

[nadeesh tv]

Hi all,

Bug Id : https://bugs.openjdk.java.net/browse/JDK-8148849

Enhanced Duration by adding   public Duration truncatedTo(TemporalUnit unit)

Please http://cr.openjdk.java.net/~ntv/8148849/webrev.00/

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Thanks and Regards,
Nadeesh TV