[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2748: move to Versioneer for git-based version-string generation

[Tahoe-LAFS]

#2748: move to Versioneer for git-based version-string generation
-----------------------+------------------------
 Reporter:  warner     |          Owner:  warner
     Type:  task       |         Status:  new
 Priority:  normal     |      Milestone:  1.11.0
Component:  packaging  |        Version:  1.10.2
 Keywords:             |  Launchpad Bug:
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 (I thought we had this ticketed already, but couldn't find it just now)

 We have code in `setup.py` to run `git describe` to figure out what
 version string to use. This allows us to make a release by doing "git
 tag", without needing to manually update a file each time.

 I wrote a system called [https://github.com/warner/versioneer Versioneer]
 to do this. It works under py2 and py3, and handles git checkouts, sdist
 tarballs, `setup.py install`, `git archive` tarballs, and more.

 We should remove our custom `setup.py` code and switch to Versioneer.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2748>
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