dashboard info by domain

[jacekkolasa]

related to netdata/netdata-cloud#541

Build dashboard from dashboard_info.js, based on domain (room | node), for example:

  "disk.util": {
    room: {
      info: "Info visible only in room overview",
      heads: [netdataDashboard.gaugeChart("Utilization in room", "12%", "", "#FF5588")],
    },
    node: {
      info: "Info visible only in node-view",
    },

    colors: "#FF5588",
    heads: [netdataDashboard.gaugeChart("Utilization", "12%", "", "#FF5588")],
    info: "Disk Utilization measures the amount of time the disk was busy with something. This is not related to its performance. 100% means that the system always had an outstanding operation on the disk. Keep in mind that depending on the underlying technology of the disk, 100% here may or may not be an indication of congestion.",
  },

If room or node keys are present, properties available there override the config for given context.

[burbuli8ra]

In general it LGTM, but just a question, why was the python version section removed?