This update for timezone fixes the following issues:

- timezone update 2016a (boo#963921)
+ America/Cayman will not observe DTS this year
+ Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
+ Asia/Tehran now has DST predictions for the year 2038 and later
+ America/Metlakatla switched from PST all year to AKST/AKDT on 2015-11-01 at 02:00.
+ America/Santa_Isabel has been removed, and replaced with a backward compatibility link to America/Tijuana.
+ Asia/Karachi's two transition times in 2002 were off by a minute.