Expand coverage of merge_tests.py's merge_to_path_with_switched_children test.
Expand coverage of merge_tests.py's merge_to_path_with_switched_children test.

* subversion/tests/cmdline/merge_tests.py
  (merge_to_path_with_switched_children): Test the edge case where a merge
  target's switched child which has a switched child itself.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@866169 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion