The server should not be set to a healthy state when it is not started

[shenqidebaozi]

When initializing the struct of the server, health is set to true by default

tidb/pkg/server/server.go

Line 249 in 54cca35

health: uatomic.NewBool(true),

But there is a lot of preparation work after starting the server, and at this time, the service cannot be set to healthy, otherwise it may cause errors. It can be set to healthy after initialization is completed.

tidb/pkg/server/server.go

Lines 457 to 467 in 54cca35

	go s.startNetworkListener(s.listener, false, errChan)
	go s.startNetworkListener(s.socket, true, errChan)
	if RunInGoTest && !isClosed(RunInGoTestChan) {
	close(RunInGoTestChan)
	}
	err = <-errChan
	if err != nil {
	return err
	}
	return <-errChan
	}