This commit contains the following JIRA issues:
HADOOP-12931. bin/hadoop work for dynamic subcommands
HADOOP-12932. bin/yarn work for dynamic subcommands
HADOOP-12933. bin/hdfs work for dynamic subcommands
HADOOP-12934. bin/mapred work for dynamic subcommands
HADOOP-12935. API documentation for dynamic subcommands
HADOOP-12936. modify hadoop-tools to take advantage of dynamic subcommands
HADOOP-13086. enable daemonization of dynamic commands
HADOOP-13087. env var doc update for dynamic commands
HADOOP-13088. fix shellprofiles in hadoop-tools to allow replacement
HADOOP-13089. hadoop distcp adds client opts twice when dynamic
HADOOP-13094. hadoop-common unit tests for dynamic commands
HADOOP-13095. hadoop-hdfs unit tests for dynamic commands
HADOOP-13107. clean up how rumen is executed
HADOOP-13108. dynamic subcommands need a way to manipulate arguments
HADOOP-13110. add a streaming subcommand to mapred
HADOOP-13111. convert hadoop gridmix to be dynamic
HADOOP-13115. dynamic subcommand docs should talk about exit vs. continue program flow
HADOOP-13117. clarify daemonization and security vars for dynamic commands
HADOOP-13120. add a --debug message when dynamic commands have been used
HADOOP-13121. rename sub-project shellprofiles to match the rest of Hadoop
HADOOP-13129. fix typo in dynamic subcommand docs
HADOOP-13151. Underscores should be escaped in dynamic subcommands document
HADOOP-13153. fix typo in debug statement for dynamic subcommands
