Configure SyncRepl (OpenLDAP replication) and related ACLs.

The clients are identified using their certificate, and connect securely
to the SyncProv.

There are a few workarounds (XXX) in the ACLs due to Postfix not
supporting SASL binds in Wheezy.
Overview:
  - Authentication (XXX: strong authentication) is required prior to any DIT
    operation (see 'olcRequires').
  - We force a Security Strength Factor of 128 or above for all operations (see
    'olcSecurity'), meaning one must use either a local connection (eg,
    ldapi://, possible since we set the 'olcLocalSSF' to 128), or TLS with at
    least 128 bits of security.
  - XXX: Services may not simple bind other than locally on a ldapi:// socket.
    If no remote access is needed, they should use SASL/EXTERNAL on a ldapi://
    socket whenever possible (if the service itself supports SASL binds).
    If remote access is needed, they should use SASL/EXTERNAL on a ldaps://
    socket, and their identity should be derived from the CN of the client
    certificate only (hence services may not simple bind).
  - Admins have restrictions similar to that of the services.
  - User access is only restricted by our global 'olcSecurity' attribute.

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