Update tox to 2.0
The commands used by constraints need at least tox 2.0 Change-Id: Ida98b68f56552e130f585bce5bf66143b9286248 Closes-Bug: #1824305
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The commands used by constraints need at least tox 2.0 Change-Id: Ida98b68f56552e130f585bce5bf66143b9286248 Closes-Bug: #1824305