Bug 693503 - matching rules do not inherit from superior attribute type
    
    https://bugzilla.redhat.com/show_bug.cgi?id=693503
    Resolves: bug 693503
    Bug Description: matching rules do not inherit from superior attribute type
    Reviewed by: nkinder (Thanks!)
    Branch: 389-ds-base-1.2.8
    Fix Description: If the attribute definition specifies a superior, use the
    superior equality, substrings, and ordering matching rule from the
    superior if not specified in the child.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no
    (cherry picked from commit b5e708a3e907381c66fbcdba2ed1fd69a99198f3)