Ticket 47489 - Under specific values of nsDS5ReplicaName, replication may get broken or updates missing
    
    Bug Description:
    	If the 'nsDS5ReplicaName' (of a replica), contains the database suffix (e.g. 'db', 'db3' or 'db4).
    	Then replication plugin fails to open the changelog. It could conduct to changelog being recreated or some
    	last updates to be corrupted.
    	A consequence that I can reproduce, is that some updates may be removed from the changelog and missing
    	updates on consumers.
    	This could conduct to replication break, if for example an entry created is not replicated and then later updated.
    
    Fix Description:
    	The fix consist to use 'PL_strrstr' rather than 'strstr' to check the database suffix is valid
    
    https://fedorahosted.org/389/ticket/47489
    
    Reviewed by: Rich Megginson (thanks Rich !)
    
    Platforms tested: Fedora 17
    
    Flag Day: no
    
    Doc impact: no
    (cherry picked from commit 7a7609d88caf9c0971e694d7eeb78f30aea7fec9)
    (cherry picked from commit ac8aad8260d3e5ed403e2d4a9967447a97925ba7)