[MERGE] fix handling of stacked-on branch in smart server

[John Arbash Meinel]

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Aaron Bentley wrote:
> Hi all,
> 
> The current HPSS stacking code treats the stacked-on URL as if it's a
> repository location, so it fails when the stacked-on branch is in a
> shared repository.  This patch fixes it so it opens the branch and gets
> the repository from that.  That way, it will follow branch references
> and open the correct repository.
> 
> Aaron

BB:approve

John
=:->
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