[issue27593] Deprecate sys._mercurial and create sys._git

[Brett Cannon]

Brett Cannon added the comment:

git actually does not always shorten to 7 characters. In git 2.11 (I think) they shorten to the shortest length to guarantee uniqueness. So `git rev-parse --short HEAD` gives a hash of de04644627 which is 10 characters.

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<http://bugs.python.org/issue27593>
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