Add priority to LocalQueue

[amy]

What would you like to be added:
We would like to add priority to LocalQueue.

Why is this needed:
We have a need to introduce 2 dimensions of priority/preemption. Here is an example:

• We have 2 types of workloads (A & B)
• A should always preempt B
• We also want ordering within A
• We have an indefinite number of workload types where we don't want to statically define say 4 priorities (Ex: A-high-priority, A-low-priority, B-high-priority, B-low-priority)
• So with the following submission order (Where A preempts all B): (A, workload priority 0) (B, 100) (A,100) (B,0) -> Queue order should be: (A,100) (A, 0) (B, 100) (B, 0)

Completion requirements:

This enhancement requires the following artifacts:

• Design doc
• API change
• Docs update

The artifacts should be linked in subsequent comments.

[tenzen-y]

This is duplicated with #752
/close

[k8s-ci-robot]

@tenzen-y: Closing this issue.

In response to this:

This is duplicated with #752
/close

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