[COOK-3561] Support out of band SSL certificates in `openldap::server`

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
[COOK-3543] Do not setup OpenLDAP server as a slave

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
Version bump to v0.12.0
Version bump to v0.12.1
[COOK-411] Allow tls_checkpeer yes