DO NOT MERGE New Japanese Era test changes with actual Reiwa name

Integrate TEST changes in OpenJDK commit for new Japanese Era name:

- 8205432: Replace the placeholder Japanese era name
http://hg.openjdk.java.net/jdk/jdk/rev/3d8934bf505a

Bug: 138560701
Test: CtsLibcoreTestCases
Test: CtsLibcoreOjTestCases
Change-Id: Ic07b536e7fd62b2d3e0fe4e9edd36d6c6f183b06
Merged-In: Ic07b536e7fd62b2d3e0fe4e9edd36d6c6f183b06