Update IANA timezone db to 2017a from 2016i

See

  http://mm.icann.org/pipermail/tz-announce/2017-February/000045.html

for details.

  - Mongolia stops observing DST.
  - America/Punta_Arenas: a new timezone for Soutthern Chile

   android/icudtl.dat 6573024 =>  6573872
   common/icudtb.dat 10129712 => 10130560
   common/icudtl.dat 10129712 => 10130560

BUG=473288
TEST=Try the following in d8 or Chrome's JS console:
 > (new Date("4/4/2017 12:00Z")).toLocaleString("en", {timeZone:
 "Asia/Ulaanbaatar"})
 "4/4/2016, 8:00:00 PM"
 > (new Date("4/4/2016 12:00Z")).toLocaleString("en", {timeZone:
 "Asia/Ulaanbaatar"})
 "4/4/2016, 9:00:00 PM"
TBR=mark

Review-Url: https://codereview.chromium.org/2755833002 .
7 files changed