Users can log in using their LDAP account (in the
ou=users,dc=kosmos,dc=org group and with the wiki attribute set to
enabled)
Add an attribute for the ldap master server, so it can be overridden in
the development environment
Refs #107
It sets up 389 Directory Server, including a TLS cert acquired using
Let's Encrypt in production (that requires ldap.kosmos.org pointing to
the server's IP)