Clearing out .pyc file before a tox run

Partial-Bug: #1220234

Change-Id: I6806bd675339de00254c353b330e4117bdeeb9c4

tox.ini

@@ -12,12 +12,16 @@ setenv = VIRTUAL_ENV={envdir}
          NOSE_OPENSTACK_RED=0.05
          NOSE_OPENSTACK_YELLOW=0.025
          NOSE_OPENSTACK_SHOW_ELAPSED=1
+         PYTHONDONTWRITEBYTECODE=1
          DJANGO_SETTINGS_MODULE=designatedashboard.settings
+whitelist_externals = find
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
        http://tarballs.openstack.org/horizon/horizon-master.tar.gz
 
-commands = {toxinidir}/manage.py test designatedashboard --settings=designatedashboard.tests.settings
+commands =
+    find . -type f -name "*.pyc" -delete
+    {toxinidir}/manage.py test designatedashboard --settings=designatedashboard.tests.settings
 
 [testenv:pep8]
 commands = flake8