Merge "Delete python bytecode before every test run"

tox.ini

@@ -13,8 +13,9 @@ install_command = {toxinidir}/tools/tox_install.sh {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 whitelist_externals = sh
-commands =
-  sh tools/pretty_tox.sh '{posargs}'
+                      find
+commands = find . -type f -name "*.py[c|o]" -delete
+           sh tools/pretty_tox.sh '{posargs}'
 
 [testenv:fullstack]
 basepython = python2.7