- For testing purposes, we would like to ensure that when we connect
to the LDAP server we cannot accidentally avoid using TLS or StartTLS.
- Also enabled the openldap `memberOf` overlay in case we want to
support group search using `memberOf` in the future.
- This required changes to the docker.io/bitnami/openldap container
image, so we're using our own fork for now. Will submit a PR to
bitnami/openldap to see if they will accept it (or something similar)
upstream.