Issue 4300, break infinite loop when bumping during move-update.

* subversion/libsvn_wc/wc_db_update_move.c
  (bump_moved_away): Add hash parameter, remove unused depth parameter,
   don't recurse on already bumped paths.
  (svn_wc__db_bump_moved_away): Create empty hash.

* subversion/tests/cmdline/update_tests.py
  (update_swapped_depth_dirs): Adjust expectations, remove XFAIL.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1437436 13f79535-47bb-0310-9956-ffa450edef68