f9f74a5 AD: replace GID/UID, do not add another one

Authored and Committed by jhrozek 8 years ago
    AD: replace GID/UID, do not add another one
    
    The code would call sysdb_attrs_add_uint32 which added another UID or GID
    to the ID=0 we already downloaded from LDAP (0 is the default value) when
    ID-mapping an entry. This led to funky behaviour later on when we wanted
    to process the ID.
    
        
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