Add zulip@localhost to memcached password database.
Add zulip@localhost to memcached password database.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulip.com>

Galexrt/docker-zulip,Galexrt/docker-zulip,Galexrt/docker-zulip