[MERGE] Consistently write to self.outf in cmd_push().

[Aaron Bentley]

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Jelmer Vernooij wrote:
> Right now, bzr push will write status messages to to /dev/stdout when
> it's updating an existing branch and write status messages
> to /dev/stderr when it has created a new branch. 
> 
> The attached patch makes it consistently write to stdout.

I don't think that's the right fix.  Push's main function is to update a
branch or working tree.  All its output is therefore incidental and
should go to stderr.

Only command whose main purpose is to produce output (diff, status,
etc.) should be writing to stdout.

Aaron
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