New: Removing update folder from temp folder during housekeeping

Fixes #697
Fixes #696

src/NzbDrone.Core/Housekeeping/Housekeepers/CleanupTemporaryUpdateFiles.cs

@@ -0,0 +1,28 @@
+using NzbDrone.Common.Disk;
+using NzbDrone.Common.EnvironmentInfo;
+using NzbDrone.Common.Extensions;
+
+namespace NzbDrone.Core.Housekeeping.Housekeepers
+{
+    public class CleanupTemporaryUpdateFiles : IHousekeepingTask
+    {
+        private readonly IDiskProvider _diskProvider;
+        private readonly IAppFolderInfo _appFolderInfo;
+
+        public CleanupTemporaryUpdateFiles(IDiskProvider diskProvider, IAppFolderInfo appFolderInfo)
+        {
+            _diskProvider = diskProvider;
+            _appFolderInfo = appFolderInfo;
+        }
+
+        public void Clean()
+        {
+            var updateSandboxFolder = _appFolderInfo.GetUpdateSandboxFolder();
+
+            if (_diskProvider.FolderExists(updateSandboxFolder))
+            {
+                _diskProvider.DeleteFolder(updateSandboxFolder, true);
+            }
+        }
+    }
+}