kiji-scoring-server: SCORSRVR-27. Make compatible with the latest model container changes

Fix the scoring server to use the latest model repository container
syntax.

Review: https://review.kiji.org/r/1912/
Reviewer: ajprax
commit: https://github.com/kijiproject/kiji-scoring-server/commit/8e62935ad7db3994751483938c68683b4f490f54