Make repos-test complete for pre-1.5 compat runs.

* subversion/tests/libsvn_repos/repos-test.c
  (node_location_segments): Report skipped tests as such.
  (test_get_file_revs): Skip for pre-1.5 repos because the feature is
                        not supported for them.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1547460 13f79535-47bb-0310-9956-ffa450edef68