devstack could not install deps [-r/home/mistral/test-requirements.txt] 解决方法

[root@vitrage mistral(keystone_admin)]# tox -egenconfig

genconfig create: /home/mistral/.tox/genconfig

genconfig installdeps: -r/home/mistral/test-requirements.txt

ERROR: could not install deps [-r/home/mistral/test-requirements.txt]

_____________________________________________________________________________________ summary ______________________________________________________________________________________

ERROR: genconfig: could not install deps [-r/home/mistral/test-requirements.txt]

解决办法：
rm -rf .tox # remove everything tox ever did here
sudo pip install --upgrade pip tox virtualenv # upgrade your tooling (maybe use 'sudo -H ')
tox -e genconfig # try to build the conf file again