Removing the FileStreamWrapper as it is unecessary (#156)

src/Microsoft.SqlTools.ServiceLayer/Utility/FileUtils.cs

@@ -0,0 +1,46 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+using System;
+using System.IO;
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
+{
+    internal static class FileUtils
+    {
+        /// <summary>
+        /// Checks if file exists and swallows exceptions, if any
+        /// </summary>
+        /// <param name="path"> path of the file</param>
+        /// <returns></returns>
+        internal static bool SafeFileExists(string path)
+        {
+            try
+            {
+                return File.Exists(path);
+            }
+            catch (Exception)
+            {
+                // Swallow exception
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Deletes a file and swallows exceptions, if any
+        /// </summary>
+        /// <param name="path"></param>
+        internal static void SafeFileDelete(string path)
+        {
+            try
+            {
+                File.Delete(path);
+            }
+            catch (Exception)
+            {
+                // Swallow exception, do nothing
+            }
+        }
+
+    }
+}