[MERGE] Add a Branch.get_parent remote call for RemoteBranch.

[John Arbash Meinel]

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Robert Collins wrote:
> Yay. Or well, its better. But not round trip reductions :(.
> 
> -Rob
> 

BB:approve

Well, fewer round trips if you can get to the point that you never call
_ensure_real(), right?

Anyway, seems fine. Turning it into an absolute url is still being done
in the client, which is a good thing (so that bzr+ssh and bzr+http can
still handle relative paths.)

John
=:->

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