[kjobctl] Add slurm-init image.

[mbobrovskyi]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add slurm-init image for kjob.

Which issue(s) this PR fixes:

Part of #3243

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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[mbobrovskyi]

/cc @mimowo

[trasc]

let's make this something like cmd/experimental/kjobctl/cmd/slurm-init/Dockerfile,

I think it's better in the long run to have a go app doing the init setup. (we can make the image smaller)