RFR:JDK-8066571:UnsupportedTemporalTypeException is thrown not only in the case of unsupported temporal

[nadeesh tv]

Hi all,

Please review a fix for
Bug Id - https://bugs.openjdk.java.net/browse/JDK-8066571 
<https://bugs.openjdk.java.net/browse/JDK-8066571>

Issue - IsoFields.Unit.issupportedBy was not checking isIso()

Solution - Moved isIso() from Filed to IsoFields sothat both Field and 
Unit can use

Apart from the above fix, corrected a documentaion error in IsoFields - 
QUARTER_OF_YEAR

webrev - http://cr.openjdk.java.net/~ntv/8066571/webrev.04/ 
<http://cr.openjdk.java.net/%7Entv/8066571/webrev.04/>

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Thanks and Regards,
Nadeesh TV