Fix storage idempotency

Author: loic-sharma

src/BaGet.Azure/BlobStorageService.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 using System.Net;
 using System.Threading;
@@ -65,10 +65,11 @@ await blob.UploadFromStreamAsync(
 
                 return PutResult.Success;
             }
-            catch (StorageException e) when(IsAlreadyExistsException(e))
+            catch (StorageException e) when (IsAlreadyExistsException(e))
             {
                 using (var targetStream = await blob.OpenReadAsync(cancellationToken))
                 {
+                    content.Position = 0;
                     return content.Matches(targetStream)
                         ? PutResult.AlreadyExists
                         : PutResult.Conflict;

src/BaGet.Core/Services/FileStorageService.cs

@@ -75,6 +75,7 @@ public async Task<PutResult> PutAsync(
             {
                 using (var targetStream = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read))
                 {
+                    content.Position = 0;
                     return content.Matches(targetStream)
                         ? PutResult.AlreadyExists
                         : PutResult.Conflict;