Resolves: bug 480869
    Description:  Bug 480869 -  DS console: Can not delete DS instance
    Fix Description: Create instance was broken, so no instances could be created for purposes of deletion.  Create instance was printing the following error:
    Unable to find Pass Through Authentication Plug-In config entry.
    This is because the search for this entry in AdminUtil.pm was getting an incorrect error message - something other than "Success"
    This is because the FileConn->getErrorString() method was returning "0" instead of "Success".
    Platforms tested: RHEL4