[docs] [issue15521] Dev Guide should say how to run tests in 2.7

Chris Jerdonek added the comment:

It is a relatively large section (nine paragraphs + six code snippets) and is primarily about the in-development branch, so I did not want to interrupt the flow with a remark specific to 2.7. I also liked that the instructions in a subsection could be linked to.

But here is a new patch.

---------- Added file: http://bugs.python.org/file26652/issue-15521-2.patch

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