I was able to work around this based on the following comment by upgrading the OS package that installs the Python cffi package with `$ sudo easy_install -U cffi`:
https://bugs.launchpad.net/devstack/+bug/1484870/comments/2
I was able to work around this based on the following comment by upgrading the OS package that installs the Python cffi package with `$ sudo easy_install -U cffi`:
https:/ /bugs.launchpad .net/devstack/ +bug/1484870/ comments/ 2