"python-memcached" supports unix sockets with "unix:/path/to/socket".
So the cache_stats should support that scheme, too.

Started memcached with:

  * memcached -l 127.0.0.1 -p 11211

  * memcached -s /tmp/socket
Tried path "unix:/tmp/socket" and "localhost:11211" as the memcached

connection in admin.
"Cache Stats" in admin dashboard works correct and caching of diffs in reviews, too.