Shorter way to select a container in the CLI

[tamasfe]

--impersonated-container-name is quite a mouthful with no short flags.

Instead of introducing a short flag for it, I'd suggest an alternative for --pod-name.

Since #293 is planned, something more general could work as a target selector.

Some ideas:

--target pod/foo-asd1234/container-name

For deployments:

--target deployment/foo

Or in case services are supported in the future:

--target svc/foo

[aviramha]

That's an interesting approach. We will start thinking about this after the MVP stable release!