The current Python Testing Interface specifies the use of
stester, so update tox.ini to use it.
Closes-bug: #1780272
Change-Id: I6b6c60486a26cfbb5793c074fe6f554c6a324846
Co-Authored-By: Nguyen Hai <nguyentrihai93@gmail.com>
We're moving glanceclient tests into the analogous directory, so we
should standardize and do the same in glance_store.
Change-Id: Icdcca1bd55be2d1ba8546bebf7ca1db72c183198