[MERGE] Change the return value of fetch() to None.

[Robert Collins]

    * ``Branch.fetch`` and ``Repository.fetch`` now return None rather
      than a count of copied revisions and failed revisions. A while back
      we stopped ever reporting failed revisions because we started
      erroring instead, and the copied revisions count is not used in the
      UI at all - indeed it only reflects the repository status not
      changes to the branch itself. (Robert Collins)

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