Add a regression test for parts of issue #3231.

Prompted by: kfogel

* subversion/tests/cmdline/basic_tests.py
  (peg_rev_on_non_existent_wc_path): New XFail test.
  (test_list): Run it.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1454179 13f79535-47bb-0310-9956-ffa450edef68