Trac Ticket #531 - loading an entry from the database should use str2entry_f
    
    https://fedorahosted.org/389/ticket/531
    
    Description: Based upon the comments by Rich Megginson (Thanks!!),
    changing the newly introduced macro to all upper case.  Plus, it
    was pointed out that the meaning of the macro name was opposite.
    Fixing these 2 issues, this patch replaces the macro str2entry_
    can_use_fast with STR2ENTRY_CANNOT_USE_FAST.