Add DebuggWrapper for http client

[7sunarni]

In function makeKubeconfigHTTPClient, if we assigned kubeconfig, will run

...
tr, err := rest.TransportFor(authConf)
...

to generate client Transport.

And inside this function, it uses DebugWrappers so it can detail http request or response if log level bigger than 6.

But others are not warped with DebugWrappers. so -v=6 not work

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