RFR:JDK-8145166 : Duration.toString violates specification

[nadeesh tv]

Hi all,

Please review

Bug Id - https://bugs.openjdk.java.net/browse/JDK-8145166 
<https://bugs.openjdk.java.net/browse/JDK-8145166>

Issue - Duration.toString violates specification for Durations which 
have value in the range -59 to -60, -119 to -120 seconds etc.

webrev - http://cr.openjdk.java.net/~ntv/8145166/webrev.00/ 
<http://cr.openjdk.java.net/%7Entv/8145166/webrev.00/>

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Thanks and Regards,
Nadeesh TV