Add a shortname to replicaschedulingpreference

[Abirdcfly]

What this PR does / why we need it:

Adds a short name rsp to replicaschedulingpreference which is easier to type in command line.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[Abirdcfly]

I signed it

[Abirdcfly]

/assign @hectorj2f

[hectorj2f]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Abirdcfly, hectorj2f

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[hectorj2f]

/lgtm