0daccb2 Make RootDSE optional

Authored and Committed by sgallagh 13 years ago
    Make RootDSE optional
    
    In violation of the standard, some LDAP servers control access to
    the RootDSE, thus preventing us from being able to read it before
    performing a bind.
    
    This patch will allow us to continue on if the RootDSE was
    inaccessible. All of the places that we use the return value of
    the RootDSE after this are already checked for NULL and use sane
    defaults if the RootDSE is unavailable