Fixing issue with HK--en lookup-key creation and validation.

 Fixing subkey creation for addresses with an acceptable language specified. Also fixing validation to work properly for these addresses. This affects places like Hong Kong, which has both English and Chinese data.

Added test data and tests to expose the issue.

Also changing the build file to show output when running tests so when they hang because of a null-pointer exception this reaches the command line! Made debugging the tests much easier.
In which case can sublevel have a --locale suffix? StandardAddressVerifier (the only call site) seems to only call it with the actual address field value.