[Bug 1801691] [NEW] Update min tox version to 2.0

[shupeng]

Public bug reported:

The commands used by constraints need at least tox 2.0.  Update to
reflect reality, which should help with local running of constraints
targets.

** Affects: python-heatclient (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Update min tox version to 2.0

Status in python-heatclient package in Ubuntu:
  New

Bug description:
  The commands used by constraints need at least tox 2.0.  Update to
  reflect reality, which should help with local running of constraints
  targets.

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