Merge changes from topic "reiwa_o_cts" into oreo-cts-dev

* changes:
  DO NOT MERGE [CtsLibcoreOjTestCases] Old Android releases can optionally support the new Japanese era
  DO NOT MERGE New Japanese Era test changes with actual Reiwa name (part 2)
  DO NOT MERGE New Japanese Era test changes with actual Reiwa name
  DO NOT MERGE New Japanese Era test changes in ojluni with a placeholder name