In particular LocMemCache doesn't have this option.

For more details, see:

http://stackoverflow.com/questions/23358787/memcache-get-returns-wrong-object-celery-django

Part of the file name template is eaten up by Python's `%` formatting,
resulting in log files missing the `s` of "stderr" and "stdout".

Also support updating repositories such as python graders
from xqwatcher/xserver