Better docs/code for glog co-existence

[coryrc]

/kind feature

Describe the solution you'd like

I think, given klog has essentially the same semantics as glog and the simplicity of the solution, this wrapper solution should be made official. The existing "co-exist with glog" suggestion has at least the one shortcoming of flags only being synced once.

I'm willing to do the work (mostly just document it) if you believe this is a good solution.

[coryrc]

Additional shortcoming (and much more important) of the existing solution is not exposing any new flags as command line options.

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