[MERGE] Refactor loopback/paramiko/openssh/ssh connection opening

[Robert Collins]

On Fri, 2006-08-25 at 15:54 +1000, Martin Pool wrote:
> 
> > +def os_specific_subprocess_params():
> > +    """Get O/S specific subprocess parameters."""
> 
> Could this move to an instance method of SubprocessVendor? 
> 
> It's also called from the code that runs 'ssh -V', but setting these
> options is not really needed to get the version. 

I'd be wary of putting O/S things in the same hierarchy as vendor
changes.

I'd be more inclined to have parameterised vendors, with an os flavour
class instead - that will give more combinations with less duplication.

-Rob
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