Add a new XFail test for the revision property caching problem discussed
in http://svn.haxx.se/dev/archive-2014-08/0235.shtml

* subversion/tests/libsvn_fs_fs/fs-fs-pack-test.c
  (revprop_caching_on_off): New test.
  (test_funcs): Add revprop_caching_on_off.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1619105 13f79535-47bb-0310-9956-ffa450edef68