[Bug 1806079] Fix proposed to nova (stable/pike)

[OpenStack Infra]

Fix proposed to branch: stable/pike
Review: https://review.openstack.org/621227

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https://bugs.launchpad.net/bugs/1806079

Title:
  revert use of stestr in stable/pike

Status in Ubuntu Cloud Archive:
  Triaged
Status in OpenStack Compute (nova):
  New

Bug description:
  The following commit changed dependencies of nova in the stable/pike
  branch and switched it to use stestr. There aren't any other projects
  (as far as I can tell) that use stestr in pike. This causes issues,
  for example, the Ubuntu cloud archive for pike doesn't have stestr. If
  possible I think this should be reverted.

  
  commit 5939ae995fdeb2746346ebd81ce223e4fe891c85
  Date:   Thu Jul 5 16:09:17 2018 -0400

      Backport tox.ini to switch to stestr
      
      The pike branch was still using ostestr (instead of stestr) which makes
      running tests significantly different from queens or master. To make
      things behave the same way this commit backports most of the tox.ini
      from queens so that pike will behave the same way for running tests.
      This does not use the standard backport mechanism because it involves a
      lot of different commits over time. It's also not a functional change
      for nova itself, so the proper procedure is less important here.
      
      Change-Id: Ie207afaf8defabc1d1eb9332f43a9753a00f784d

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