Comment 13 for bug 1487645

The cause is the following:

- oslo.vmware requires urllib3 and if that requirement is uncapped, it installs 1.11
- no one tends to install over the default system python-requests which is 2.2.1
- for an unexplained reason, urllib3 1.11 and requests 2.2.1 do not mix nor will they mix (I'm not going to dig into why urllib3 1.11 broke requests 2.2.1 because 2.2.1 is absolutely ancient)

The solutions:

- install a version of requests from this year
- cap urllib3