swig-py: Sort the paths in the update test to avoid spurious failures.

* subversion/tests/swig/python/tests/client.py
  (test_update4): The ordering isn't necessarily guaranteed so sort.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1595061 13f79535-47bb-0310-9956-ffa450edef68