kiji-schema: SCHEMA-364. Fix KijiDataRequestBuilder MaxVersions error messages

issue: https://jira.kiji.org/browse/SCHEMA-364
review: https://review.kiji.org/r/1582
commit: https://github.com/kijiproject/kiji-schema/commit/7ef17ac097f23cae53dbbf7998e21b6fcc0b60fa