Implement id checking when determining current_resource

[normanjoyner]

When executing action :kill on a container, I realized I would have to supply the image, command and container name to successfully find and kill said container. I was planning on simply providing the id, and using that as the uid to determine which container to kill. This pull request allows current_resource matching to be short circuited if provided a valid container id.

• It's worth noting that in its current state, most actions will require that image, command, and name are provided in the LWRP in order to successfully execute the action.

[bflad]

Nice, this is great addition. I think I misleadingly named those methods *_matches; some should have been named *_matches_if_exists. I'll merge this and refactor the other methods names appropriately.