Recently, I have updated Google App Engine from 1.9.17 to 1.9.18 via Google Cloud SDK by using command \'gcloud components update\' in Windows 7 64 bit. After that I wasn\'t
Jumping on the answer from @Tzach and adding some info.
The file to modify is containers.py
for me it is located here : C:\Program Files\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\docker
If you can't modify it because the file is open in an application, it is in fact that the folder is protected. Just copy/paste the file on your desktop and modify it from there. then copy it back in the original folder.