api: support priority+qos apis. #8613

Job	Run time
golangci-lint	4m 27s
unit-tests(Check Go modules)	52s
unit-tests(Check manifests)	1m 16s
unit-tests(Check auto-generated codes)	3m 26s
unit-tests(Verify gofmt)	48s
unit-tests(Verify govet)	5m 19s
unit-tests(Run Go build)	3m 53s
unit-tests(Run Go test)	8m 55s
build-and-push (koordlet)	3m 39s
build-and-push (koord-manager)	2m 16s
build-and-push (koord-scheduler)	3m 11s
build-and-push (koord-descheduler)	2m 57s
	40m 59s

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