Retrieve all data sources users

Example response

{
  "users": [
    {
      "name": "docbrown",
      "permissions": [
        {
          "scope": "all",
          "allowed": [
            "ViewAdmin",
            "ViewChronograf",
            "CreateDatabase",
            "CreateUserAndRole",
            "DropDatabase",
            "DropData",
            "ReadData",
            "WriteData",
            "ManageShard",
            "ManageContinuousQuery",
            "ManageQuery",
            "ManageSubscription",
            "Monitor",
            "KapacitorAPI"
          ]
        }
      ],
      "roles": [
        {
          "name": "timetravelers",
          "permissions": [
            {
              "scope": "database",
              "name": "telegraf",
              "allowed": [
                "ReadData",
                "WriteData"
              ]
            }
          ],
          "links": {
            "self": "/chronograf/v1/sources/3/roles/timetravelers"
          }
        }
      ],
      "links": {
        "self": "/chronograf/v1/sources/3/users/docbrown"
      }
    }
  ]
}