Hey gang.

        Could I get a quick review of HADOOP-14202?  This changes  a few things:

        * Makes the rest of the _USER vars consistent with the other changes in 
trunk (e.g., HADOOP_SECURE_DN_USER becomes HDFS_DATANODE_SECURE_USER)
        * deprecation warnings as necessary
        * cleans up more of the privileged code handling, adding more unit 
tests in the process
        * Optimizes a ton of code out of hadoop, mapred, hdfs, and yarn now 
that the jsvc vars are treated similarly across all four sub projects
        * Fixes quite a few shellcheck errors by adding shellcheck source lines
        * doc updates to reflect above


Thanks.
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