`src/test/python/apache/aurora/api_util.py` is not apart of any pants targets

There is no pants target which lists `src/test/python/apache/aurora/api_util.py` as a source file. `src/test/python/apache/aurora/BUILD` just contains:

python_test_suite(
  name = 'all',
  dependencies = [
    'src/test/python/apache/aurora/admin:all',
    'src/test/python/apache/aurora/client:all',
    'src/test/python/apache/aurora/common:all',
    'src/test/python/apache/aurora/config:all',
    'src/test/python/apache/aurora/executor:all',
  ]
)

Improper source dependency specification can cause us some trouble if we are not careful, it is probably best to move this file closer to where it is used.