Merge changes from topic \'icu-cherry-pick-from-nyc-to-aosp\'
am: cd4f7e1

* commit 'cd4f7e12037acd16f500dc9a4be98e51fe58a11b':
  Hide general utility methods in ICU4J.
  ICU4J: Removed a couple of useless or internal methods from API
  ICU4J: Update API for using civil version of IslamicCalendar

Change-Id: I789d6ffff03338c73e52720f165e456419fba457