Add a regression test for update failing to update keywords when the incoming change is equal to the local change.
Add a regression test for update failing to update keywords when the incoming
change is equal to the local change.

Found by: Vincent Lefevre <vincent-svn{_AT_}vinc17.net>

See the email thread "keywords not updated after an update that doesn't
change the file due to local changes" started on 2015-06-17, e.g.
<http://svn.haxx.se/dev/archive-2015-06/0147.shtml>.

* subversion/tests/cmdline/update_tests.py
  (update_keywords_on_shortcut): New test, marked as XFail.
  (test_list): Run it.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1686988 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion