Comment 4 for bug 1750627

Bionic only changes the timezone rules for North Korea. Testing results:
TZ=America/Los_Angeles date -d '2018-09-27 00:00:00 UTC'
TZ=America/Los_Angeles date -d '2018-12-27 00:00:00 UTC'
TZ=Asia/Pyongyang date -d '2018-01-27 00:00:00 UTC'
TZ=Asia/Pyongyang date -d '2018-05-04 00:00:00 UTC'
TZ=Asia/Pyongyang date -d '2018-05-06 00:00:00 UTC'
TZ=America/Sao_Paulo date -d '2018-10-20 00:00:00 UTC'
TZ=America/Sao_Paulo date -d '2018-10-28 00:00:00 UTC'
TZ=America/Sao_Paulo date -d '2018-11-05 00:00:00 UTC'
TZ=Asia/Gaza date -d '2018-03-23 00:00:00 UTC'
TZ=Asia/Gaza date -d '2018-03-24 00:00:00 UTC'
TZ=Asia/Gaza date -d '2018-04-01 00:00:00 UTC'

--- bionic-before.log 2018-09-27 13:03:07.904805193 -0700
+++ bionic-after.log 2018-09-27 13:04:30.485819083 -0700
@@ -2,7 +2,7 @@
 Wed Dec 26 16:00:00 PST 2018
 Sat Jan 27 08:30:00 KST 2018
 Fri May 4 08:30:00 KST 2018
-Sun May 6 08:30:00 KST 2018
+Sun May 6 09:00:00 KST 2018
 Fri Oct 19 21:00:00 -03 2018
 Sat Oct 27 21:00:00 -03 2018
 Sun Nov 4 22:00:00 -02 2018

As expected, only North Korea's timezone shows any change before and after the SRU.