Remove pypy job

Pypy is not tested in OpenStack anymore, remove the job.

Change-Id: Ia9e1fead782e8d5deef35e9d52c730e1aa083ac3

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = pypy,py37,pep8
+envlist = py37,pep8
 minversion = 3.1.1
 skipsdist = True
 ignore_basepython_conflict = True
@@ -17,13 +17,6 @@ commands =
     stestr run --slowest {posargs}
 whitelist_externals = find
 
-[testenv:pypy]
-deps =
-       -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
- setuptools<3.2
-       -r{toxinidir}/requirements.txt
-       -r{toxinidir}/test-requirements.txt
-
 [testenv:pep8]
 sitepackages = False
 commands = flake8