[issue13238] Add shell command helpers to shutil module

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I discovered a couple of APIs that were moved from the commands module to the subprocess module in 3.0:
http://docs.python.org/dev/library/subprocess#subprocess.getstatusoutput

However, they have issues, especially on Windows: http://bugs.python.org/issue10197

So part of this patch would include deprecating those two interfaces in favour of the new shutil ones - the existing APIs break the subprocess promise of never invoking the shell implicitly.

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