kiji-scoring: SCORE-154. Move createKVStoreReaderFactory to ScoringUtils

issue: https://jira.kiji.org/browse/SCORE-154
review: https://review.kiji.org/r/1640
commit: https://github.com/kijiproject/kiji-scoring/commit/e0849a993047c081076ecde5dcd4a3771a196b38
kiji-scoring: SCORE-156. Fix resource leaks in TestInternalFreshKijiTableReader

issue: https://jira.kiji.org/browse/SCORE-156
review: https://review.kiji.org/r/1647
commit: https://github.com/kijiproject/kiji-scoring/commit/c77740b1e2e8639d02bb9992c1f755fa324976f2