Suggestion for PLC configuration files.

[su600]

When try to add a PLC device, 4 yaml flies are needed and serval files should be edited accordingly.
But currently, the PLC configuration of different protocols are written in different yaml files.
Such as Siemens-S7 IP is written in plc-deviceshifu-deployment.yaml, for OPCUA IP is written in opcua_edgedevice.yaml, they are different type files.

I think users or developers may feel confused when facing this situation.
So, suggest to optimize the file organization, to unify the PLC configuration in the same type file, establish a unified specification, thus whenever add a PLC, we always know to change the same yaml file.

[tomqin93]

Hi @su600 , we have added support for this in #275, we'll go ahead and close this issue now. Feel free to test and re-open if necessary !