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Add swit-2.3.0 target
Avoid to install anything except flake8 which is the only thing needed in the pep8 env
(this is how Swift does it : https://github.com/openstack/swift/blob/49e7c25876cf4d3bc9412443f881e8472e88e827/tox.ini)
Mock 1.1 (latest version as the time of writing) dropped py26 compatibility.
Can't have mock dependency both in test-requirements.txt and tox.ini,
otherwise pip crashes with 'Double requirement given' error.
That might be fixed in a future version of pip :
see pypa/pip#56
and pypa/pip#988