Add Image Name to the metrics collected

[jimonreal]

It would be really helpful to have the imageName of the running container, that way you may associate all containers of the same image running on the same host, and on different hosts.

[jimonreal]

From Docker API v1.19 the Image name field is no longer available, instead there's an array of the Image Tags, this would be usefull to cross information, knowing from what Image is the container comming from, and the data. That way we may correlate the stats correctly.