At the moment the LDAP server role does nothing to set-up any kind of LDAP directory structure.

However, a number of roles, such as mail server and XMPP server, depend on having a specific LDAP directory structure available and populated.

It would be beneficial if the role took care of at least some of the work for setting-up the directory structure for these other roles.

In particular, the role should:

* Create the ou=people, ou=services, and ou=groups under base DN.
* Have an option to generate entries needed for the mail server set-up (ou=domains,ou=mail and ou=aliases,ou=mail under ou=services).
* Have an option for creating login entries for apps under ou=services (such as cn=postfix,ou=services, cn=dovecot,ou=servicces...). It should be possible to remove services this way as well (some kind of absent thing).
* Have an option for creating group entries under ou=groups. It should be possible to remove such groups too. Group membership should not be managed.