Using READPAST,READCOMMITTEDLOCK instead of NOLOCK to not read uncomm…

…itted rows (#1292)

src/NServiceBus.Transport.SqlServer/Queuing/SqlConstants.cs

@@ -104,7 +104,7 @@ SELECT TOP 1 GETUTCDATE() as UtcNow, Due as NextDue
 ORDER BY Due";
 
         public static readonly string PeekText = @"
-SELECT isnull(cast(max([RowVersion]) - min([RowVersion]) + 1 AS int), 0) Id FROM {0} WITH (nolock)";
+SELECT isnull(cast(max([RowVersion]) - min([RowVersion]) + 1 AS int), 0) Id FROM {0} WITH (READPAST, READCOMMITTEDLOCK)";
 
         public static readonly string AddMessageBodyStringColumn = @"
 IF NOT EXISTS (