Ryan

hello, i want to fix this issue: Encrypt MqttPassword and Token in file edgecore.yaml. please assign it to me. thanks.

please provide more logs of cloudcore and edgecore

according to this part of log, the connection between cloudcore and edgecore was broker. the specific reason still needs to be further analyzed 

we are testing this pr and will reorganize the commits later.

@gy95 @fisherxu please help to review this pr. thanks!

> Can you split the pr into two part, one pr is the proto interface definition and automatically generated code and vendor, the other pr is the interface implementation and...

> please add **copyright header** for every new added file i have added the copyright header.

all the review comments have been modified. while it should be merged only after this pr(https://github.com/kubeedge/kubeedge/pull/4119) is merged.

> all the review comments have been modified. please help me to re-check this pr. thanks.

the mapper of DMI is proposed in this pr(https://github.com/kubeedge/mappers-go/pull/78). this mapper is developed for modbus.