[ldapvi] using add/delete instead of replace

[Julien Soula]

hello,

Currently all attribute modification are done using "replace"
operation. When the number of values is very big (e.g. several
thousands of members in a group) and you just want to add or delete
some few, using replacement takes much time whereas add/delete is
instantaneous.

I change the way to generate ldif in order to use add/delete when the
changes are lesser than for replacement.

I join the patch if someone is interested in.

Sincerly,
-- 
Julien
	<< Vous n'avez rien a dire... Parlons-en! >>
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