Following up on r1550986 and r1550985, update arguments of the repos relpath
calculation function to avoid a db query for every normal node touched
during update.

* subversion/libsvn_wc/update_editor.c
  (calculate_repos_relpath): Add old_repos_relpath argument as replacement of
    db and adding.
  (open_root): Obtain base information, even when shadowed. But when shadowed
    avoid move checks like before r1550986.
  (add_directory,
   open_directory,
   add_file,
   open_file): Update caller,


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1550988 13f79535-47bb-0310-9956-ffa450edef68