[MERGE] Make {BzrDir,Repository}.find_branches a generator.

[Andrew Bennetts]

This patch simply changes BzrDir.find_branches and Repository.find_branches to
be generators, rather than functions that return lists.  This allows the callers
to get incremental results.

I did this because I use “bzr merged-branches” (from
https://launchpad.net/bzr-removable).  This patch makes that command feel much
faster, because it starts giving output much much sooner.

-Andrew.

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