[MERGE] setup.py script explicitly checks for Python version. (#200569)

[John Arbash Meinel]

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Alexander Belchenko wrote:
| Currently there is python reinvocation logic in setup.py, but it's
| actually useless,
| as bug #200569 reveals. The patch removes this logic and provide
| explicit check for
| Python version before import bzrlib.
|
| I think it's worth to merge to bzr.dev.
|

BB:tweak

I think we should use sys.version_info rather than sys.hexversion

All you really need to do is move the existing check earlier (and I would get
rid of the REINVOKE stuff).

John
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