koordlet: fix core sched conflicts with GI and revise API (#1829) #7

Job	Run time
golangci-lint	6m 7s
unit-tests(Check Go modules)	32s
unit-tests(Check manifests)	49s
unit-tests(Check auto-generated codes)	4m 26s
unit-tests(Verify gofmt)	40s
unit-tests(Verify govet)	4m 17s
unit-tests(Run Go build)	1m 53s
unit-tests(Run Go test)	5m 46s
build-and-push (koordlet)	3m 37s
build-and-push (koord-manager)	2m 59s
build-and-push (koord-scheduler)	3m 0s
build-and-push (koord-descheduler)	2m 41s
	36m 47s

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