kiji-scoring: SCORE-187. Non-deterministic failure in TestInternalFreshKijiTableReader.testPartialFreshening

issue: https://jira.kiji.org/browse/SCORE-187
review: https://review.kiji.org/r/2126
commit: https://github.com/kijiproject/kiji-scoring/commit/fc1aeda0669e87d60c19272591de01bbaae2387d