Filter devices at IoT Hub level

[kbeaugrand]

We are filtering devices for screens at backend.

We must ensure that we can filter the devices at the IoT Hub Level:

• IoT-Hub-Portal/src/AzureIoTHub.Portal/Server/Controllers/ConcentratorsController.cs

  Line 48 in 01d412f

  var itemFilter = items.Where(x => x.Tags["deviceType"] == "LoRa Concentrator");

• IoT-Hub-Portal/src/AzureIoTHub.Portal/Server/Controllers/DevicesController.cs

  Line 63 in 01d412f

  var itemFilter = items.Where(item => item.Tags.Contains("deviceType") && item.Tags["deviceType"] != "LoRa Concentrator");