Merge changes from topic \'icu-cherry-pick-from-nyc-to-aosp\'
am: cd4f7e12
* commit 'cd4f7e12':
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