[MERGE] * ``RemoteBzrDir._get_tree_branch`` no longer triggers ``_ensure_real``

[Robert Collins]

This reduces the occurences of _ensure_real being invoked on
RemoteBzrDir - a good thing for performance and removing the VFS
dependency.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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