Avoid using the deprecated api /devices in favor of /query

[rido-min]

To retrieve the devices registered in the selected hub, this extension is using the /devices api:
https://docs.microsoft.com/en-us/rest/api/iothub/service/devices/get-devices

This api is not recommended as is going to be deprecated in favor of /query api:
https://docs.microsoft.com/en-us/rest/api/iothub/service/query/get-twins