This commit includes the following changes:
HADOOP-13356. Add a function to handle command_subcommand_OPTS
HADOOP-13355. Handle HADOOP_CLIENT_OPTS in a function
HADOOP-13554. Add an equivalent of hadoop_subcmd_opts for secure opts
HADOOP-13562. Change hadoop_subcommand_opts to use only uppercase
HADOOP-13358. Modify HDFS to use hadoop_subcommand_opts
HADOOP-13357. Modify common to use hadoop_subcommand_opts
HADOOP-13359. Modify YARN to use hadoop_subcommand_opts
HADOOP-13361. Modify hadoop_verify_user to be consistent with hadoop_subcommand_opts (ie more granularity)
HADOOP-13564. modify mapred to use hadoop_subcommand_opts
HADOOP-13563. hadoop_subcommand_opts should print name not actual content during debug
HADOOP-13360. Documentation for HADOOP_subcommand_OPTS
This closesapache/hadoop#126
