Add a FS API test for svn_fs_node_created_path and svn_fs_node_created_rev.

* subversion/tests/libsvn_fs/fs-test.c
  (test_node_created_info): The new test.
  (test_funcs): Register the new test.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1636749 13f79535-47bb-0310-9956-ffa450edef68