Refactor ExternalConnection::sendStatus

[koudis]

Function ExternalConnection::sendStatus consumes deviceState argument.

This argument does not make any sense because not in all cases it is used or it is overwritten!

Refactor the function in a manner that does not need deviceState argument (it is always used with value ExternalProtocol::Status_DeviceState_DISCONNECT, connect, ...).

Split function in two - for standard status and for disconnect status...? Or use explicit enum class and not reuse protobuf message state?