Add some regression tests for log with copyfrom history.
Add some regression tests for log with copyfrom history.

* subversion/tests/clients/cmdline/log_tests.py
  (log_through_copyfrom_history, log_rN_through_copyfrom_history): New.
  (test_list): Add new tests, with log_rN_through_copyfrom_history an XFail.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@846874 13f79535-47bb-0310-9956-ffa450edef68

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