ICU-20536 Japanese era Reiwa support in ICU 63

[jefgen]

This also includes updating the time zone data to tzdata2019a.

Checklist

• Issue filed: https://unicode-org.atlassian.net/browse/ICU-20536
• Updated PR title and link in previous line to include Issue number
• Issue accepted
• Tests included
• Documentation is changed or added

ALLOW_MANY_COMMITS=true

[jefgen]

Note: The failing CI tests all look to be expected.

ICU4C:

-------------
| ***     FAILING TEST SUMMARY FOR:              intltest  
         TestConsistentPivot
      DataDrivenFormatTest
   format
| *** END FAILING TEST SUMMARY FOR:              intltest
---------------
ALL TESTS SUMMARY:
ok:  testdata iotest cintltst
===== ERRS:  intltest

ICU4J:

	FAILED
[TestConsistentPivot#6format] FAIL: got Heisei 8 expected Reiwa 8
junit.framework.AssertionFailedError: [TestConsistentPivot#6format] FAIL: got Heisei 8 expected Reiwa 8

[jira-pull-request-webhook]

Notice: the branch changed across the force-push!

• icu4c/source/test/testdata/format.txt is different
• icu4j/main/shared/data/icudata.jar is different
• icu4j/main/shared/data/icutzdata.jar is different
• icu4j/main/shared/data/testdata.jar is different

View Diff Across Force-Push

~ Your Friendly Jira-GitHub PR Checker Bot

[jefgen]

Note: Per discussion with Yoshito, the plan is to comment out the data-driven test cases that are conditional on the current system time so that the builds and tests pass regardless of the system time.