Adds the required tox.ini for tests

Change-Id: Id5f8b4330709e6ecea3e5d516fccf662ad246a18

tox.ini

@@ -0,0 +1,33 @@
+[tox]
+minversion = 2.0
+envlist = py37,py36,py35,py27,docs
+skipsdist = True
+
+[testenv]
+usedevelop = True
+install_command = pip install -U {opts} {packages}
+setenv = VIRTUAL_ENV={envdir}
+         PYTHONDONTWRITEBYTECODE = 1
+         LANGUAGE=en_US
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+commands =	py.test
+
+[testenv:pep8]
+basepython = python3
+commands = flake8
+
+#[testenv:cover]
+#commands = python setup.py testr --coverage --testr-args='{posargs}'
+
+[flake8]
+# E123, E125 skipped as they are invalid PEP-8.
+show-source = True
+ignore = E123,E125
+builtins = _
+exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,pbbuild,pbdelivery,pbconf
+
+[testenv:venv]
+basepython = python3
+setenv = PYTHONHASHSEED=0
+commands = {posargs}