Defect: Shared connection info when duplicating IP connection with device

[mbreissi]

The "Make a Copy" action exposed on the SlaveNode (IP connection with device) uses the reference to existing ModbusConnection object when creating the new SlaveNode. Thus, any changes made to the IP information on the resulting new slave node will alter the original SlaveNode and all nodes copied from it. That should only be the behavior when creating explicit IP Connection nodes that have descendant slave nodes.