- Import key management functions from the new 'credentials' package
- Refactor password callback to avoid jumping on error
- Fix a bug with reading the new openssh pem keys
- Disconnect session immediately on startup/authentication errors
- Raise a warning when the GC collects an ssh session which is still connected.
- Rename ssh_info() to ssh_session_info()
- ssh_tunnel() now closes listen port when interrupted while waiting