ssh_connect.py:  Added --default-port option to specify the default connection port
ssh_connect.py:  Added --auth-only option to skip the connection info prompts and ask only for the credentials (user/password)
ssh_connect.py:  Added --default-host for consistency but kept old option --default_host for backwards compatibility
ssh_connect.py:  Added vim modeline comment at the end of the file to enforce code formatting