[Feature request] Tail logs of all deployed containers

For Skaffold to be truly useful as a CI tool it will need to be able to tail the logs of all containers in the deployed cluster.

Say I've written a database integration test for my application. My application is built by Skaffold, the database image is ready made and fetched from docker hub, both are included in a deployment. When running `skaffold run` in this situation I'll only see my application logs. If the database container crashed I won't be able to see why that happened.