[MERGE] Support for Putty SSH implementation

[Alexander Belchenko]

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Dmitry Vasiliev пишет:
> 
> The attached patch adds support for Putty's plink SSH implementation.
> Also slightly refactored SSH negotiation code and added some tests.

I'll try to check your patch. But... it seems that it does not work:

C:\work\Bazaar\sandbox\bzr.dev>bzr push sftp://bialix@aaronbentley.com/~/repo/bzr.dev/
Unable to open connection:
Host does not existbzr: ERROR: Unable to connect to SSH host aaronbentley.com; EOF during negotiation


While with ususal bzr.dev and paramiko it push OK.

- --
Alexander
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