scheduler: fix reservation reserved updated #8663

Job	Run time
golangci-lint	4m 1s
unit-tests(Check Go modules)	31s
unit-tests(Check manifests)	36s
unit-tests(Check auto-generated codes)	2m 40s
unit-tests(Verify gofmt)	37s
unit-tests(Verify govet)	1m 12s
unit-tests(Run Go build)	1m 21s
unit-tests(Run Go test)	5m 13s
build-and-push (koordlet)	3m 34s
build-and-push (koord-manager)	2m 15s
build-and-push (koord-scheduler)	3m 10s
build-and-push (koord-descheduler)	2m 50s
	28m 0s

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