make docker_build returns error

the docker_build make option returns an error.
[docker_build_error.log](https://github.com/globocom/database-as-a-service/files/1977690/docker_build_error.log)

Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-install-vcF8dU/python-faasclient/setup.py", line 6, in
from pip.download import PipSession
ImportError: No module named download

the error appears to be related to importing pip's internal code into the program

Start with the docker_build make option and the attached docker_build_error.log, then inspect the reported python-faasclient setup.py failure. Reproduce the ImportError involving pip.download and identify the dependency or import issue causing the build to fail. Done means docker_build completes without this error.

Written by the indexing model from the issue text.