kiji-checkin: BENTO-60. Update upgrade client to be usable for Wibi Enterprise.

issue: https://jira.kiji.org/browse/BENTO-60
review: https://review.kiji.org/r/1345
commit: https://github.com/kijiproject/kiji-checkin/commit/5a170daa66ba83ca73b69684fc55fbdd70baecd3