[rfc] [patch] sftp unit tests without ssh

[Robey Pointer]

Here's a patch to add a subclass of SFTPServer (called  
SFTPServerWithoutSSH) that sets up a fake sftp server over loopback  
but uses a special ssh vendor ("loopback") which just wraps a plain  
socket instead of setting up both ends of an SSH Transport.  What  
this means is that tests using SFTPServerWithoutSSH will use sftp  
without all the overhead of actually setting up a secure channel.

On my ibook, it drops the './bzr selftest' time from about 5 minutes  
to about 3 minutes -- pretty significant.

We discussed having at least one test still use a full sftp-over-ssh  
setup.  I didn't do that because I'm not entirely sure how, but it  
should just be a matter of using SFTPServer for a test instead of  
SFTPServerWithoutSSH.

I posted the branch here:
	http://www.lag.net/~robey/bzr.dev.sftp/
but it's only one patch, so that's attached below.

robey


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