ticket:8260: use standard collation locale keywords in collper2

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@35770 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10778: Add test to ensure that MeasureUnit is backward compatible with ICU 53.1

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@35784 251d0590-4201-4cf1-90de-194747b24ca1