[MERGE] Support for Putty SSH implementation

[Aaron Bentley]

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John Arbash Meinel wrote:
> Alexander Belchenko wrote:
>>>I wonder why do not provide support of sftp via plink in the paramiko library
>>>itself? IIRC, paramiko use OpenSSH when possible. So adding new SSH provider
>>>to paramiko may be more consistent?

> I don't think paramiko uses Openssh, bzr uses openssh and the passes
> that connection off to paramiko.

On machines with OpenSSH installed, this allows us to take advantage of
any existing OpenSSH configuration, such as public keys, key agents,
forwarding, etc.  Does that advantage apply to plink?

The same advantages apply to other programs that use SFTP, but since
Paramiko's original purpose was to provide an SSH implementation, Robey
might not want to use OpenSSH/plink/SSH.

Aaron
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