update min tox version to 2.0
The commands used by constraints need at least tox 2.0. Update to reflect reality, which should help with local running of constraints targets. Note: this is a clone of mriedem's manila change [1]. [1] I27348462a21daab479d76b24b48e3a4e017504cc Change-Id: I185c8f80285f2e7b4f3d3d45a2e6a7dd5741bc1d
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