setuptools 8.2 spews end user error messages for package version issues

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Originally reported by: sdague (Bitbucket: sdague, GitHub: sdague)

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On Ubuntu 14.04 python-debian is version 0.1.21-nmu2ubuntu2.

That means if you have setuptools 8.2 installed on the system all executions of python programs, for any reason, create the following error:

http://logs.openstack.org/22/142322/1/check/check-tempest-dsvm-full/395143d/logs/devstacklog.txt.gz#_2014-12-18_12_34_46_433

(happens 222 times during a devstack run).

This is incredibly user hostile when they are doing nothing related to package installation, and probably encourages them to upgrade this system dependency to something which then breaks their system.

These kinds of warnings should only be emitted when actual opperations involving the package version are done. For instance, installation or removal.

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/306

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Original comment by dstufft (Bitbucket: dstufft, GitHub: dstufft):

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Fixed by https://github.com/jaraco/setuptools/pull/23

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Update changelog; fixes #306.