Cherry-pick: ticket:12994: Have C++ ListFormatter use ures_getAllItemsWithFallback to load resources; add tests for C and J

http://bugs.icu-project.org/trac/changeset/39926

Bug fix: This fixes a regression from ICU 57.

Test: mmma libcore external/icu
Test: ant check
Test: make check
Test: CtsIcuTestCases
Test: CtsLibcoreTestCases
Change-Id: Id1a7a8c718acb35ea7d30c5665e575d6819e212f
6 files changed