RFR: [8u] 8205432: Replace the placeholder Japanese era name

[Andrew John Hughes]

Bug: https://bugs.openjdk.java.net/browse/JDK-8205432
Webrev: https://cr.openjdk.java.net/~andrew/openjdk8/8205432/webrev.01/

This is a relatively clean backport, with a few exceptions, mostly due
to unneeded copyright changes or moved files:

* 8u has FormatData_ja.java and JavaTimeSupplementary_ja.java in
src/share/classes/sun/text/resources/ja/ rather than
src/jdk.localedata/share/classes/sun/text/resources/ext/
* The XML files are in
src/share/classes/sun/util/cldr/resources/21_0_1/common/main/ rather
than src/jdk.localedata/share/classes/sun/util/cldr/resources/common/main/
* 8u doesn't have test/jdk/java/util/Calendar/ZoneOffsets.java
(JDK-8031145 & JDK-8165296 look like potential future test backports)
* The changes in
src/java.base/share/classes/sun/util/calendar/LocalGregorianCalendar.java take
place in src/share/lib/calendars.properties in 8u

I compared both with the 11u version of this patch and the 8u version of
JDK-8202088, as well as searching the code base for 'NewEra'.

Thanks,
-- 
Andrew :)

Senior Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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