Provide a test case for the new svn_fs_fs__dump_index API.
Provide a test case for the new svn_fs_fs__dump_index API.

* subversion/tests/libsvn_fs_fs/fs-fs-private-test.c
  (dump_baton_t,
   dump_index_entry): Callback code verifying the we receive
                      complete and consistent data.
  (dump_index): The new test case.
  (test_funcs): Register the new test.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1632859 13f79535-47bb-0310-9956-ffa450edef68

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