ticket:9101: CollationTest remove rawbase/CEs, use only rules/compare; and other cleanup, tests & fixes

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@34695 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: remove now-obsolete unorm_it.h / unorm_openIter()

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@34696 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: move real getEquivalentReorderCodes() implementation into the Collator base class, see ticket #10540

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@34697 251d0590-4201-4cf1-90de-194747b24ca1