Test coverage improvements: Patch upstream changes

Patches upstream changes for all the changes listed in the
following page:
http://bugs.icu-project.org/trac/log/icu4j/branches/fabalbon/56-1-test-coverage?action=stop_on_copy&mode=stop_on_copy&rev=38590&stop_rev=&limit=100

Bug: 27238545

(cherry picked from commit 16530f4b6f99034c591018244ec10a3ba1f403d7)

Change-Id: Ie4aaf6e23d3a54c428f308d843a9d479b11ccd3a
24 files changed