Bug 750625 - Fix Coverity (11109, 11110, 11111) Uninitialized pointer read
    
    https://bugzilla.redhat.com/show_bug.cgi?id=750625
    
    plugins/replication/cl5_config.c (changelog5_read_config)
    
    Bug Description: Using uninitialized value "config.dir".
    changelog config is set with the changelog config entry in
    changelog5_read_config.  If the search for the config entry
    succeeds but there's no entry returned (actually, there is
    no such case, though), the config structure is not initialized.
    
    Fix Description: if changelog config entry search is success and
    no entry is returned, initialize the config structure with NULLs.