[Bug 1801661] [NEW] fix tox python3 overrides

[shupeng]

Public bug reported:

We want to default to running all tox environments under python 3, so
set the basepython value in each environment.

We do not want to specify a minor version number, because we do not
want to have to update the file every time we upgrade python.

We do not want to set the override once in testenv, because that
breaks the more specific versions used in default environments like
py35 and py36.

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

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https://bugs.launchpad.net/bugs/1801661

Title:
  fix tox python3 overrides

Status in python-openstackclient package in Ubuntu:
  New

Bug description:
  We want to default to running all tox environments under python 3, so
  set the basepython value in each environment.

  We do not want to specify a minor version number, because we do not
  want to have to update the file every time we upgrade python.

  We do not want to set the override once in testenv, because that
  breaks the more specific versions used in default environments like
  py35 and py36.

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