Offline domain join through sensitive userdata blob for cloudbase-init

I. The sethostname plugin should check for specific userdata (starting with "ARAIAMzMz") and if such data is present, then these things happen: a. The content of the userdata is passed through a temporary file for an offline domain join: "djoin.exe /requestODJ /loadfile <path> /localos /windowspath %systemroot% b. T...