The docs build is failing in master due to a dependency change in the python
tools being used:
```
pkg_resources.VersionConflict: (setuptools 0.9.8
(/usr/lib/python2.7/site-packages), Requirement.parse('setuptools>=36.2.7'))
```
The full build log is here:
https://builds.apache.org/view/S-Z/view/TrafficControl/job/trafficcontrol-master-build/1090/consoleText
[ Full content available at:
https://github.com/apache/trafficcontrol/issues/2891 ]
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