kiji-schema: SCHEMA-870. AbstractCassandraKijiIntegrationTest is using old-style Cassandra KijiURI

issue: https://jira.kiji.org/browse/SCHEMA-870
review: https://review.kiji.org/r/2039
commit: https://github.com/kijiproject/kiji-schema/commit/92a8327b2b45ef7c0c761a5e5ad1f150e118e15e