SCHEMA-482. Plug ZooKeeper layout notifications in HBaseKijiTable.

 - HBaseKijiTable registers itself as a live client of a Kiji table.
 - HBaseKijiTable subscribes to layout notification from ZooKeeper.
 - Adds an integration test for the general behavior.

issue: https://jira.kiji.org/browse/SCHEMA-482
review: https://review.kiji.org/r/862