Special-case LDAP_SIZELIMIT_EXCEEDED
    
    Previous version of the SSSD did not abort the async LDAP search
    operation on errors. In cases where the request ended in progress, such
    as when the paging was very strictly limited, the old versions at least
    returned partial data.
    
    This patch special-cases the LDAP_SIZELIMIT_EXCEEDED error to avoid a
    user-visible regression.
    
    https://fedorahosted.org/sssd/ticket/1322