Please review: [389 Project] #415: winsync doesn't sync DN valued attributes if DS DN value doesn't exist

[Noriko Hosoi]

https://fedorahosted.org/389/ticket/415

https://fedorahosted.org/389/attachment/ticket/415/0001-Ticket-415-winsyn...

Bug description:
2 case were fixed.

1) A group on AD has a member which is not a target of windows
    sync and exists only on AD.  The member value in the group is
    synchronized to DS.  If an operation is executed on AD so that
    the member is replaced with other members which are the target
    of the windows sync, the new member values are not synchronized.
2) If a group on AD and DS have members which are local and are
    not synchronized and the members are removed in the group on
    the other side, the delete operation is synchronized and
    deletes all the members including the local members.

Fix description:

1) In windows_generate_update_mods, even if a sync'ed member value
    in a DS entry is not the target of windows sync and it is does
    not exist on DS, a following modify operation including the member
    value is proceeded by confirming the existence on AD.
2) AD->DS: in windows_map_mods_for_replay
    DS->AD: in windwos_generate_update_mods
    added the code to check if an attribute is completely deleted on
    one side, then the each value on the other side is in the sync
    scope or not.  Put the value to the mod for the delete only if
    the value is in the sync scope.