[#312] cmd/node: Switch health status while the application is running

Switch health status to:
  * STARTING after the initialization of app resources and before bootup;
  * READY after bootup and until shutting down;
  * SHUTTING_DOWN before exiting the application.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-node/main.go

@@ -5,6 +5,7 @@ import (
 	"flag"
 	"log"
 
+	"github.com/nspcc-dev/neofs-node/pkg/services/control"
 	"github.com/nspcc-dev/neofs-node/pkg/util/grace"
 	"go.uber.org/zap"
 )
@@ -23,10 +24,16 @@ func main() {
 
 	initApp(c)
 
+	c.setHealthStatus(control.HealthStatus_STARTING)
+
 	bootUp(c)
 
+	c.setHealthStatus(control.HealthStatus_READY)
+
 	wait(c)
 
+	c.setHealthStatus(control.HealthStatus_SHUTTING_DOWN)
+
 	shutdown(c)
 }