Fix tox command for running tests

Fix the command for running tox tests and add the missing file.

Change-Id: I41b78a1e39b818ed0534a02bc7736a5c461567e8
diff --git a/tox.ini b/tox.ini
index 011fc96..1f1ce01 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@
    VIRTUAL_ENV={envdir}
    PYTHONWARNINGS=default::DeprecationWarning
 deps = -r{toxinidir}/test-requirements.txt
-commands = python setup.py test --slowest --testr-args='{posargs}'
+commands = python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:pep8]
 commands =