Ticket 48270: fail to index an attribute with a specific matching rule
    
    Bug Description:
    	During index configuration, if a new rule type matching rule is added
    	(attribute 'nsMatchingRule') it creates an indexer.
    	If the indexer was not already registered (plugin_mr_bind),
    
    	In a first step it tries to find/call, for the specified matching rule, an indexer_create callback of
    	all the registered matching rule plugins .
    
    	If no indexer_create function exist or match the specified matching rule, then it tries to find
    	a registered matching rule plugins that matches the specified matching rule (plg_mr_names).
    
    	The problem occurs in the first step, because it uses 'rc' for intermediate returned code and
    	can erronously believe the first step was successful although no indexer_create was found.
    	So it skips the second step and no matching rule plugin is found.
    
    Fix Description:
    	The fix consist to avoid using the 'rc' return code in intermediate slapi-pblock-get/set
    
    https://fedorahosted.org/389/ticket/48270
    
    Reviewed by: Noriko Hosoi (Thank you sooo much Noriko !!)
    
    Platforms tested: F17
    
    Flag Day: no
    
    Doc impact: no