ticket:9101: svn merge -r 32800:33424 ^/icu/trunk (nearly ICU 51)

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@33436 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: dont leak the CollationRoot, fix citertst warnings

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@33437 251d0590-4201-4cf1-90de-194747b24ca1