[DISCUSS] HADOOP-13341 Merge Request

[Allen Wittenauer <aw...@effectivemachines.com>]

Before requesting a merge vote, I'd like for folks to take a look at HADOOP-13341.  This branch changes how the vast majority of the _OPTS variables work in various ways, making things easier for devs and users by helping to make the rules consistent.  It also clarifies/cleans up how the _USER variables work.  Probably worth while pointing out that this work is also required if we ever want to make spaces in file paths work properly (see HADOOP-13365, where I'm attempting to fix that too... ugh.).

Also, most of the patch is test code, comments, and documentation... so while it's a large patch, there's not much actual code. :)

Thanks.
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