kiji-schema: SCHEMA-684. Replace HBase's MiniZKCluster with Curator's TestingCluster

issue: https://jira.kiji.org/browse/SCHEMA-684
review: https://review.kiji.org/r/1785
commit: https://github.com/kijiproject/kiji-schema/commit/202fdf39df23f29a6238f1b269faf9bddab1363c