Comment 4 for bug 1768233

I bisected it and this seemed to be the culprit:

4adec30131d8de1c8ea902c431c1b7e16bc4d8d5 is the first bad commit
commit 4adec30131d8de1c8ea902c431c1b7e16bc4d8d5
Author: Kyle Fazzari <email address hidden>
Date: Sat Nov 18 05:12:55 2017 -0800

    python plugin: use extracted pip (#1607)

    Simplify the Python plugin and its tests by using the independently
    tested pip that was extracted in previous commits. All functionality
    should remain the same.

    Signed-off-by: Kyle Fazzari <email address hidden>

:040000 040000 1d0e8b6a261d844846a90d13be8e08e4bd7463dd 2d56773183319e3dcfe93ad5f9f74b7a719856f0 M snapcraft