add schedulingPolicy KEP

[yastij]

This re-opens kubernetes/community#1937

This still needs to be re-formatted to meet KEP requirements.

I will update the content to reflect enforcement points that we discussed (at admission and scheduling time)

/cc @tallclair @bsalamat

FYI @arnaudmz

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[justaugustus]

Please remove any references to NEXT_KEP_NUMBER and rename the KEP to just be the draft date and KEP title.
KEP numbers will be obsolete once #703 merges.

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[yastij]

/remove-lifecycle stale

[k82cn]

is that still necessary?

[yastij]

Yes, I’ll have cycles to work on this in the next week

[justaugustus]

/remove-sig architecture pm

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