[RFC] bzr+ssh without paramiko

[John Arbash Meinel]

Theoretically, we don't need paramiko if we have an ssh process that we
can spawn.

The attached patch changes bzrlib/transport/ssh.py so that if paramiko
isn't present, it still tries to run.

In simple testing bzr+ssh:// does work.

I marked this as RFC, because I'm not sure if this is too hackish of a
fix. Also, I'm not sure how to test this, because it is very environment
dependent. (You need to not have paramiko installed or it would get
imported).

Also, things may not fail as nicely as they could when paramiko isn't
installed. sftp.py still gives the same exception, though. So it
shouldn't effect those things.

John
=:->
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