Refactor some tests to reduce duplication of code.  No functional change.
Refactor some tests to reduce duplication of code.  No functional change.

* subversion/tests/clients/cmdline/schedule_tests.py
  (check_reversion): New function, factored out of various tests.
  (revert_add_files, revert_add_directories, revert_nested_adds,
   revert_add_executable, revert_delete_files, revert_delete_dirs): 
    Factor out some stuff into check_reversion.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@848033 13f79535-47bb-0310-9956-ffa450edef68

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