kiji-bento: BENTO-70. Scoring server is not properly packaged into bento

issue: https://jira.kiji.org/browse/BENTO-70
review: https://review.kiji.org/r/1665
commit: https://github.com/kijiproject/kiji-bento/commit/a2bd300d710aac6716fdf323619c1f166dd475e1