public void diff(final Configuration rhs, final Configuration included, final Configuration excluded) {
        included.peers = new ArrayList<>(this.peers);
        included.peers.removeAll(rhs.peers);
        excluded.peers = new ArrayList<>(rhs.peers);
        excluded.peers.removeAll(this.peers);
    }
Get the difference between |*this| and |rhs|
 |included| would be assigned to |*this| - |rhs|
 |excluded| would be assigned to |rhs| - |*this|
jraft-core/src/main/java/com/alipay/sofa/jraft/conf/Configuration.java