Add test for issue #4319 'faulty merge notifications when target subtree
unreadable'.

*subversion/tests/cmdline/merge_authz_tests.py

  (merge_notifications_and_authz_skips): New.

  (test_list): Add merge_notifications_and_authz_skips.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1445870 13f79535-47bb-0310-9956-ffa450edef68