Added 4 test cases:
TestListNodes
TestWatchNodesCount
TestSingleNodeQuery
TestBatchNodeQuery
$ go test -timeout 500s global-resource-service/resource-management/test/integration/service-api
ok global-resource-service/resource-management/test/integration/service-api 330.747s
Added 4 test cases: TestListNodes TestWatchNodesCount TestSingleNodeQuery TestBatchNodeQuery