Ticket 47601 - Plugin library path validation prevents intentional loading of out-of-tree modules
    
    Bug Description:  The fix for ticket 47384 does not allow plugins to have their shared libs stored
                      anywhere else but in the default location.
    
    Fix Description:  Allow plugin paths that are not in the default area if the absolute path has been
                      specified, and the library can be opened.
    
    https://fedorahosted.org/389/ticket/47601
    
    Reviewed by: rmeggins(Thanks!)
    (cherry picked from commit d8e8a90fd151d131666d9d72bd6d40d356f4bdf0)