Modifications to ensure that hdfs dirs are created successfully, and
hadoop daemons are configured to run using the correct users;
additionally, the 'historyserver' supervisor program was removed since
it duplicates the 'hadoop-history' program, and the 'hadoop-daemon'
supervisor program has been commented out (it doesn't start successfully
due to 'org.apache.hadoop.HadoopIllegalArgumentException: HA is not
enabled for this namenode.')