Start startup tasks async

MediaBrowser.WebDashboard/ServerEntryPoint.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading.Tasks;
 using MediaBrowser.Common;
 using MediaBrowser.Controller.Plugins;
 
@@ -23,9 +24,11 @@ namespace MediaBrowser.WebDashboard
             Instance = this;
         }
 
-        public void Run()
+        public Task RunAsync()
         {
             PluginConfigurationPages = _appHost.GetExports<IPluginConfigurationPage>().ToList();
+
+            return Task.CompletedTask;
         }
 
         public void Dispose()