Description of problem:
The Japanese Era name will be changed on 2019-05-01 / component icu / rhel5
icu code is referring to the japanese era name.

(snippet from the rhel7 icu code)
 364 void IntlCalendarTest::TestJapanese() {
 365     UDate timeA = Calendar::getNow();
 366     
 367     /* Sorry.. japancal.h is private! */
 368 #define JapaneseCalendar_MEIJI  232
 369 #define JapaneseCalendar_TAISHO 233
 370 #define JapaneseCalendar_SHOWA  234
 371 #define JapaneseCalendar_HEISEI 235
 372     
 373     // BE 2542 == 1999 CE
 374     int32_t data[] = { 
 375         //       Jera         Jyr  Gyear   m             d
 376         JapaneseCalendar_MEIJI, 1, 1868, UCAL_SEPTEMBER, 8,
 377         JapaneseCalendar_MEIJI, 1, 1868, UCAL_SEPTEMBER, 9,
 378         JapaneseCalendar_MEIJI, 2, 1869, UCAL_JUNE, 4,
 379         JapaneseCalendar_MEIJI, 45, 1912, UCAL_JULY, 29,
 380         JapaneseCalendar_TAISHO, 1, 1912, UCAL_JULY, 30,
 381         JapaneseCalendar_TAISHO, 1, 1912, UCAL_AUGUST, 1,
 382         
 383         // new tests (not in java)
 384         JapaneseCalendar_SHOWA,     64,   1989,  UCAL_JANUARY, 7,  // Test current era transition (different code path than others)
 385         JapaneseCalendar_HEISEI,    1,   1989,  UCAL_JANUARY, 8,
 386         JapaneseCalendar_HEISEI,    1,   1989,  UCAL_JANUARY, 9,
 387         JapaneseCalendar_HEISEI,    1,   1989,  UCAL_DECEMBER, 20,
 388         JapaneseCalendar_HEISEI,  15,  2003,  UCAL_MAY, 22,
 389         -1,-1,-1,-1,-1,-1,-1,-1,-1,-1
 390     };

Actual results:
No reference to the upcoming era.

Expected results:
The upcoming era name should properly be dealed with.

Additional info:
- https://en.wikipedia.org/wiki/Japanese_imperial_transition,_2019
- the new era name has not yet been announced.
- We also have to modify glibc (for example bz1555189) and openjdk.