[MERGE] Return BranchPushResult instance from lossy_push() and make dpush print

[John Arbash Meinel]

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Jelmer Vernooij wrote:
> dpush so far didn't print any output. This patch makes it use the same
> mechanism as pull() and push() by having it return a BranchPushResult,
> which contains a report() method that can print the results.
> 
> Cheers,
> 
> Jelmer
> 

BB:comment

This really seems like something that we need per-branch tests on. That
Branch.lossy_push() both does a reasonable thing, and returns an
appropriate object.

Even if it isn't per-branch, at least a direct test, rather than
indirectly testing via run_bzr(...)

John
=:->

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