Fake suggestion interfaces needless

[andreyvelich]

/kind question

Do we need fake implementation of Suggestion interface and Suggestion Client interface?

I can see that Suggestion interface was added in: #502 and it is used here: https://github.com/kubeflow/katib/blob/master/pkg/controller.v1beta1/experiment/experiment_controller.go#L85-L87.
Do we have a use-case when it is needed for user?

Suggestion client interface was added in: #742. And it is not used now.

What do you think @gaocegege @johnugeorge ?

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[gaocegege]

When will users need it? I cannot figure out such use cases.

[andreyvelich]

@gaocegege In that case, I will delete it.

[andreyvelich]

/assign @andreyvelich