Log Message:
Update to 1.27

Changes:

* Fixes for LWP-2.0
* Reduced size of the medium packets to 1500.
* Explicitly clear the EchoTimestamp when we receive an out-of-order
  SFTP data packet to avoid sending a stale timestamp value.
* Make sure we retransmit at least one packet once we hit EOF so that we
  can continue to make progress.