kiji-bento: BENTO-93. Update dead dependency on kiji-schema 1.5.1-SNAPSHOT

issue: https://jira.kiji.org/browse/BENTO-93
review: https://review.kiji.org/r/1988
commit: https://github.com/kijiproject/kiji-bento/commit/bcc352ac60bc1b8e04b674ec80261db8dce5157d