kubectl: remove -- leading flag requirement

[tstromberg]

It's not fun from a usability point of view.

NOTE: This may be challenging, and require intercepting "kubectl" as a subcommand before Cobra gets it's hands on it.

[afbjorklund]

One suggested variant was adding a command to install it, but we didn't want to do that (#4697).

Another approach would be add a shell alias, but that has different syntax on different shells...

$ alias mk='minikube kubectl --'
$ mk version
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.0", GitCommit:"9e991415386e4cf155a24b1da15becaa390438d8", GitTreeState:"clean", BuildDate:"2020-03-25T14:58:59Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.0", GitCommit:"9e991415386e4cf155a24b1da15becaa390438d8", GitTreeState:"clean", BuildDate:"2020-03-25T14:50:46Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"linux/amd64"}

Maybe it could be a feature of the shell module ? Still has to be called with e.g. eval though

Also need to decide on a name, like minikube.kubectl - since k or mk might conflict with user.

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[priyawadhwa]

/remove-lifecycle rotten

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