Close database connections last on shutdown (#11683)

The job workers and cluster discovery components require access to the
database during shutdown. To avoid issues, we leave the database open
until the last step of the shutdown process.

app/server.go

@@ -332,10 +332,6 @@ func (s *Server) Shutdown() error {
 	s.StopHTTPServer()
 	s.WaitForGoroutines()
 
-	if s.Store != nil {
-		s.Store.Close()
-	}
-
 	if s.htmlTemplateWatcher != nil {
 		s.htmlTemplateWatcher.Close()
 	}
@@ -358,6 +354,10 @@ func (s *Server) Shutdown() error {
 		s.Jobs.StopSchedulers()
 	}
 
+	if s.Store != nil {
+		s.Store.Close()
+	}
+
 	mlog.Info("Server stopped")
 	return nil
 }