Make kiji-schema-extras compile. Fix some checkstyle.
Fixes some checkstyle and find bugs errors.

Comments out more code to do this and uncomments copyrights.
SCHEMA-903. Update AbstractCassandraKijiIntegrationTest key for external cluster.
cherry-picked from master. can forcefully remove this commit if you want

issue: https://jira.kiji.org/browse/SCHEMA-903