[MERGE] Fix InterBranch.pull tests.

[John Arbash Meinel]

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Robert Collins wrote:
> bb:comment
> 
> what does your svn puller do differently?
> 
> -Rob

I believe the issue is that generating the 'revno' for a bzr-svn branch
requires walking the whole ancestry to determine what revisions
are/are-not in the given branch. (Basically, count-from-scratch.)

So instead, he does the fetch, and then uses the bzr branch to set the
revno as part of 'set_last_revision_info'.

At least, that is what he's mentioned working on in the past.

John
=:->

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