[turba] new hook to reduce the number of CNs in LDAP entries

[liamr at umich.edu]

Our LDAP entries have bunches of CNs, eg..

   Mary Brown
   Mary A Brown
   Mary Alice Brown
   Mary A Brown 1

..and thats kind of annoying to look at, so I've written a new hook (and made
the appropriate patch to turba) to allow you to filter (reduce) the number of
CNs returned per LDAP entry.

My example hook uses "create_function", so I wasn't sure about the formating.
I've attached the diff.

Liam
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