This is basically a copy of the template used in oslo.messaging
under change 78f113780510b741bc974c69eb9b0718cd657c1d.
Conflicts:
tox.ini
NOTE(mriedem): The conflict was on the envlist value. The
BRANCH_NAME variable is also changed from master to stable/newton.
Change-Id: I8be883215f27abb58d15b85e8542cbdf32000bac
(cherry picked from commit c7162854f7)