Add support for python 3.8

- Introduce support of python 3.8 [1].
- python 3.8 support only jsonschema 3.2.0 [2] (also supported by py37 & py36)
- remove py27 obsolete code

[1] https://governance.openstack.org/tc/reference/runtimes/victoria.html#python-runtimes-for-victoria
[2] https://github.com/Julian/jsonschema/pull/627

Change-Id: Iab5d3e2e4f58bc175119029d98b381a33b09b523

requirements.txt

@@ -7,7 +7,7 @@ pbr>=1.6 # Apache-2.0
 Mako>=0.4.0 # MIT
 botocore>=1.5.1 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
-jsonschema!=2.5.0,<3.0.0,>=2.0.0 # MIT
+jsonschema>=3.2.0 # MIT
 keystoneauth1>=2.1.0 # Apache-2.0
 oslo.concurrency>=3.5.0 # Apache-2.0
 oslo.serialization>=1.10.0 # Apache-2.0

setup.cfg

@@ -3,12 +3,13 @@ name = sahara-tests
 summary = Sahara tests
 description-file = README.rst
 license = Apache Software License
+python-requires = >=3.6
 classifiers =
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
     Environment :: OpenStack
     Intended Audience :: Information Technology
     Intended Audience :: System Administrators

setup.py

@@ -16,14 +16,6 @@
 # THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
 import setuptools
 
-# In python < 2.7.4, a lazy loading of package `pbr` will break
-# setuptools if some other modules registered functions in `atexit`.
-# solution from: http://bugs.python.org/issue15881#msg170215
-try:
-    import multiprocessing  # noqa
-except ImportError:
-    pass
-
 setuptools.setup(
     setup_requires=['pbr>=1.8'],
     pbr=True)

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py37,py36,py35,pep8,releasenotes
+envlist = py38,py37,py36,pep8,releasenotes
 minversion = 2.0
 skipsdist = True
 # this allows tox to infer the base python from the environment name