Bug 693466 - Unable to change schema online
    
    https://bugzilla.redhat.com/show_bug.cgi?id=693466
    Resolves: bug 693466
    Bug Description: Unable to change schema online
    Reviewed by: nkinder (Thanks!)
    Branch: RHEL-6
    Fix Description: The problem is only with attributes that specify a SUP.
    There was some old code that assumed the attributes were stored in a list
    in order of SUP.  This is not the case.  They are stored in a hashtable
    which is not in any order at all.  But the check is redundant anyway.
    If a SUP is specified, the code already checks if the superior exists and
    returns an error if not.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no
    (cherry picked from commit 466fced49dd1b6893c19ce5a7ecd8121f6eceeab)
    (cherry picked from commit 5c1cd5f4b3519530ac62df3dd31291e4bf65852a)