ticket:10669: reinstate parallel CLDR-to-ICU build


git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35031 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10646: Improve test readability.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35036 251d0590-4201-4cf1-90de-194747b24ca1