[MERGE] Implement copy_tree on copy_tree_to_transport

[John Arbash Meinel]

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Aaron Bentley wrote:
> Hi all,
> 
> This patch is a refactoring that extracts
> Transport.copy_tree_to_transport from Transport.copy_tree.
> 
> copy_tree_to_transport makes it very easy to mirror a directory tree
> from one machine to another.  I've just added a mirror command to
> hitchhiker, and I had to do it by copying and pasting this code.
> 
> Aaron

BB:approve

John
=:->
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