Fix temporary pypy gate issue with setuptools

Adding a fix proposed in https://bugs.launchpad.net/openstack-ci/+bug/1290562
to avoid continuous gate failures because of setuptools issue reported in the
bug linked above.

Temporary Fixes-bug: #1290562

Change-Id: Id7ff477c4168f42bee2c3c9a8fc70ff7953bf10a

tox.ini

@@ -15,6 +15,11 @@ commands =
 [tox:jenkins]
 downloadcache = ~/cache/pip
 
+[testenv:pypy]
+deps = setuptools<3.2
+       -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+
 [testenv:pep8]
 commands = flake8