Add a regression test for issue #2751 - Directory prop modification disappear in commits of mis-ordered transactions.
Add a regression test for issue #2751 - Directory prop modification
disappear in commits of mis-ordered transactions.

* subversion/tests/libsvn_fs/fs-test.c
  (unordered_txn_dirprops): New regression test (XFAILing)
  (test_funcs): Add reference to new test.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion