RFR:JDK-8054978:java.time.Duration.parse() fails for negative duration with 0 seconds and nanos

[nadeesh tv]

Hi all,

Please review a fix for Bug Id - 
https://bugs.openjdk.java.net/browse/JDK-8054978 
<https://bugs.openjdk.java.net/browse/JDK-8054978>

Issue - While parsing a negative Duration with 0 seconds and a few 
nanoseconds, the nanoseconds are wrongly considered positive

Apart from the above , corrected a documentation error in the examples 
for Duration.parse(CharSequence)

webrev - http://cr.openjdk.java.net/~ntv/8054978/webrev.02 
<http://cr.openjdk.java.net/%7Entv/8054978/webrev.01/>

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Thanks and Regards,
Nadeesh TV