Support verbose/granular output levels

[alicerum]

As discussed in #6 , cli should output via klog and support multiple levels of verbosity.

[adambkaplan]

/kind feature

Marking this a feature since we would expose a -v option for log verbosity (or some equivalent).

[adambkaplan]

We may want to look at what kubectl does with respect to logging:

https://github.com/kubernetes/kubectl

[christoph-jerolimov]

I will take a look