Review Request : JDK-8066652 : Default TimeZone is GMT not local if user.timezone is invalid on Mac OS

[Rachna Goel]

Hi,

Please review the fix for JDK-8066652.
Bug :  https://bugs.openjdk.java.net/browse/JDK-8066652

Webrev: http://cr.openjdk.java.net/~rgoel/JDK-8066652/webrev.01/

Fix : 1. Used thread safe function localtime_r() to retrieve system 
timezone.
         2. timezone retrieved should be "GMT" if system timezone is 
"GMT" and user specifies a fake timezone using user.timezone system 
property.
              Earlier it used to be "GMT+00:00" which is wrong.

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Thanks,
Rachna