FR: Python layer should support nose2 as testrunner

[znewman01]

First, thanks a bunch to the Spacemacs developers for a great piece of software!

It looks like nose is abandoned-ish. It has a successor, nose2.

I have nose2 working-ish with the Python layer (I only use some of the functionality, and haven't done all of the variations of tests you can run [1]. I basically just copied nose.el, did s/nosetests/nose2/, fixed up some flag names, and plumbed in 'nose2 to all the defuns in funcs.el.

It'd be relatively easy (famous last words, I know) to flesh out what I have and contribute upstream. Would you be interested in a PR?

Longer-term, I think we'd want to refactor to make adding test-runners easier (there's a lot of different places to modify, and a lot of assumptions that there are only 2 test runners). I may or may not be interested in doing that.

[1]: That is:

• 'spacemacs/python-test-all
• 'spacemacs/python-test-module
• 'spacemacs/python-test-one
• 'spacemacs/python-test-pdb-all
• 'spacemacs/python-test-pdb-module
• 'spacemacs/python-test-pdb-one
• 'spacemacs/python-test-pdb-suite
• 'spacemacs/python-test-suite

[cvchaparro]

This is still a relevant issue and I'd be willing to help with some of these updates, if needed.

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