Add a test case for our revprop change visbility guarantees.
Add a test case for our revprop change visbility guarantees.

* subversion/tests/libsvn_fs/fs-test.c
  (set_revprop,
   check_revprop): New utility functions.
  (revprop_refresh): The new test.
  (test_funcs): Register the new test.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1708970 13f79535-47bb-0310-9956-ffa450edef68

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