[MERGE] Fix race condition with branch hooks during cloning when the new branch is stacked.

[John Arbash Meinel]

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Robert Collins wrote:
> Fairly straight forward - we were setting the tip in a new stacked
> branch without configuring the branch as stacked. This breaks plugins
> which hook branch tip changes.
> 
> -Rob
> 

This seems fine, but we need to make sure that Jelmer knows this is
going to break bzr-svn. If only because of the api_minimum_version change.

John
=:->

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