Run exemplars data through data check

Deleted Component: other

The CLDR tests should run the contents of the exemplars directory through the data checks. For example, this would have prevented .

I’ve tried to fix it, but stumbled at the following. When changing tools/cldr-unittest/build.xml to pass "-S common,exemplars,seed" as `datacheck.arg` when running the command "ant cldr.datacheck.logged" in tools/cldr-unittest, the test suite crashes in tools/java/org/unicode/cldr/util/SimpleFactory.java on line 490:

The reason is that SimpleFactory.getSourceDirectoryForLocale() returns null. Its implementation calls `CLDRFile.isSupplementalName(localeName)` to determine whether the locale is in supplemental. The implementation of `CLDRFile.isSupplementalName()` is this:

However, `SUPPLEMENTAL_NAMES`, which is defined in tools/java/org/unicode/cldr/util/CLDRFile.java on line 117, is not actually a locale name, but rather looks like a list of XML attribute:

Maybe that’s a red herring. In any case, it would be good to run the contents of `exemplars` through the data checks.