CSHARP-1704: TcpStreamFactory is leaking socket handlers on exception

Author: floatas

src/MongoDB.Driver.Core/Core/Connections/TcpStreamFactory.cs

@@ -150,6 +150,7 @@ private void Connect(Socket socket, EndPoint endPoint, CancellationToken cancell
  {
  if (!cancelled && !timedOut)
  {
+ socket.Dispose();
  throw;
  }
  }
@@ -200,6 +201,7 @@ private async Task ConnectAsync(Socket socket, EndPoint endPoint, CancellationTo
  {
  if (!cancelled && !timedOut)
  {
+ socket.Dispose();
  throw;
  }
  }