Create XFailing testcase for 'git unidiffs'. 
Create XFailing testcase for 'git unidiffs'. 

The test handles added, deleted and modified paths and passes if
SVN_EXPERIMENTAL_PATCH is defined.

* subversion/tests/cmdline/diff_tests.py
  (make_git_diff_header): New.
  (diff_git_format): New test.
  (test_list): Add diff_git_format as XFailing.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@952149 13f79535-47bb-0310-9956-ffa450edef68

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