2.1.0b4 and 2.0.3 have Windows Installers - ssh behaviour

[DeeJay]

Noting this in the Rel Notes -

Changelog:

Compatibility Breaks
********************

* The BZR_SSH environmental variable may now be set to the path of a secure
  shell client. If currently set to the value ``ssh`` it will now guess the
  vendor of the program with that name, to restore the old behaviour that
  indicated the SSH Corporation client use ``sshcorp`` instead as the magic
  string. (Martin <gzlist at googlemail.com>, #176292)

Does that mean some concrete action is required of a user to keep ssh
connections running over paramiko, or is there
a sane default in the absence of BZR_SSH?