Add py37 and API v2 jobs (scenario, tempest)

Run also:
- the API v2 scenario and tempest tests
- the py37 tests
on both the check
and the gate queue.
No need to set LIBS_FROM_GIT anymore, Zuul sets it automatically
for projects listed under request-projects.

The addition of py37 implements the following task:
Story: 2004073
Task: 27450
Change-Id: I4ff72efa0af76bd2e710e9c1be4d77fd6af83582

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 658f92c..aa5e71e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py35,py36,pypy,pep8,releasenotes
+envlist = py27,py35,py36,py37,pypy,pep8,releasenotes
 minversion = 2.0
 skipsdist = True