[MERGE] Fix log --limit (broken by log filtering patch).

[John Arbash Meinel]

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Robert Collins wrote:
> Rather a trivial fix, this updates the log test to actually fail on
> bzr.dev, then fixes log --limit.
> 
> -Rob
> 

BB:approve

I agree your method seems a bit better than the "double break" form. Both have
tests for this, we may want to include both.

John
=:->

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