memcached.
This means testing with local dev caches (not memcache) will warn
developers if they are introducing inadvertent importabilities. There
is also the ability to silence the warning if a dev is not planning to
use memcache and knows what they are doing with their keys.
Thanks to Carl Meyer for the patch. Fixed#6447.
Backport of r13766 from trunk.
git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13767 bcc190cf-cafb-0310-a4f2-bffc1f526a37