[MERGE] Support for Putty SSH implementation

[John Arbash Meinel]

Alexander Belchenko wrote:
> John Arbash Meinel ?8H5B:
> [skip]
>> My best guess is that it isn't finding plink on the path, but that is
>> only a guess.
> 
> I think it's unlikely because in this case bzr should roll back to using
> paramiko alone.
> 

can you try to mutter() the command that is being run. To make sure that
we are spawning the right command?

John
=:->