Don't run background tasks in command-line host

--HG--
branch : dev

src/Orchard/Commands/CommandBackgroundService.cs

@@ -0,0 +1,9 @@
+using Orchard.Tasks;
+
+namespace Orchard.Commands {
+    public class CommandBackgroundService : IBackgroundService {
+        public void Sweep() {
+            // Don't run any background service in command line
+        }
+    }
+}

src/Orchard/Commands/CommandHostAgent.cs

@@ -9,6 +9,7 @@ using Orchard.Environment;
 using Orchard.Environment.Configuration;
 using Orchard.Localization;
 using Orchard.Logging;
+using Orchard.Tasks;
 
 namespace Orchard.Commands {
     /// <summary>
@@ -141,6 +142,7 @@ namespace Orchard.Commands {
         protected void ContainerRegistrations(ContainerBuilder builder) {
             MvcSingletons(builder);
             builder.RegisterType<CommandHostEnvironment>().As<IHostEnvironment>();
+            builder.RegisterType<CommandBackgroundService>().As<IBackgroundService>();
         }
 
         protected void MvcSingletons(ContainerBuilder builder) {

src/Orchard/Orchard.Framework.csproj

@@ -135,6 +135,7 @@
     <Compile Include="Caching\Signals.cs" />
     <Compile Include="Collections\IPageOfItems.cs" />
     <Compile Include="Collections\PageOfItems.cs" />
+    <Compile Include="Commands\CommandBackgroundService.cs" />
     <Compile Include="Commands\CommandHostEnvironment.cs" />
     <Compile Include="ContentManagement\Aspects\ICommonAspect.cs">
       <SubType>Code</SubType>