ticket:11375: ICU root collation: remove Cyrillic contractions, adjust a test that depended on them

git-svn-id: http://source.icu-project.org/repos/icu/icu@36731 251d0590-4201-4cf1-90de-194747b24ca1
ticket:11371 Regex cleanups, create development branch.

git-svn-id: http://source.icu-project.org/repos/icu/icu@36732 251d0590-4201-4cf1-90de-194747b24ca1
ticket:11371 Regex pattern compiler cleanups.

git-svn-id: http://source.icu-project.org/repos/icu/icu@36733 251d0590-4201-4cf1-90de-194747b24ca1