Set hadoop_log_dir so we can test symlink code
Create symlinks from default Hadoop log dirs to specified ones
Handle HBASE_LOG_DIR
Handle HIVE_LOG_DIR
Handle ZOOKEEPER_LOG_DIR
Handle OOZIE_LOG_DIR
Switch back to zookeeper group
Merge pull request #113 from caskdata/feature/log-dir-symlink

Symlink log directories to standard locations