[8u] RFR 8073446: TimeZone getOffset API does not return a dst offset between years 2038-2137

[Zhengyu Gu]

I would like to backport this patch to 8u for parity with Oracle 8u301.

The original bug: https://bugs.openjdk.java.net/browse/JDK-8073446
The original patch: https://github.com/openjdk/jdk/commit/7284f013

The original patch does not apply cleanly. Other than copyright year 
conflict in ZoneInfo.java, the new test uses new language feature "var" 
that is not supported in 8u, 8u patch changed them to their concrete types.

8u webrev: http://cr.openjdk.java.net/~zgu/JDK-8073446-8u/webrev.00/

Test:
   passed new test.

Thanks,

-Zhengyu