ticket:10802: Add multithreaded test for unified cache.

git-svn-id: http://source.icu-project.org/repos/icu/icu@36108 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10802: Add test to ensure that equals and hashcode work as expected on LocaleCacheKey.

git-svn-id: http://source.icu-project.org/repos/icu/icu@36109 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10802: Change classes that use LRUCache to use UnifiedCache.

git-svn-id: http://source.icu-project.org/repos/icu/icu@36110 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10877 Dictionary Break, work in progress.

git-svn-id: http://source.icu-project.org/repos/icu/icu@36111 251d0590-4201-4cf1-90de-194747b24ca1