Allow user impersonation as a cli flag

[logan-bobo]

What would you like to be added: The ability to pass an impersonation flag to kuttl to allow for the impersonation of users

Why is this needed: There are situations where you may only have access to a single user that is able to impersonate other users that have privileged access. This would allow for the --as flag to be passed to kuttl to enable user impersonation. For example kubectl kuttl test ... --as <user>

Happy to pick this up if accepted ✋

[porridge]

I hope there is a library we can use to be compatible with kubectl w.r.t. translation of the command line flag value to the actual headers that the client needs to send?

Otherwise (if we do the translation by hand) it would be a shame to become subtly incompatible over time.

[logan-bobo]

I hope there is a library we can use to be compatible with kubectl w.r.t. translation of the command line flag value to the actual headers that the client needs to send?

I agree we should be able to use k8s.io/cli-runtime/pkg/genericclioptions to add a set of generic kubectl flags that can generate a rest config to use with client-go

[porridge]

Sounds good! It would be awesome if you could contribute this feature!

[logan-bobo]

@porridge I believe we can also now close this one out.

[porridge]

Done in #549