This uses a new 389-ds plugin, Managed Entries, to automatically create
a group entry when a user is created. The DNA plugin ensures that the
group has a gidNumber that matches the users uidNumber. When the user is
removed the group is automatically removed as well.
If the managed entries plugin is not available or if a specific, separate
range for gidNumber is passed in at install time then User-Private Groups
will not be configured.
The code checking for the Managed Entries plugin may be removed at some
point. This is there because this plugin is only available in a 389-ds
alpha release currently (1.2.6-a4).
