On the 1.8.x-r1536854 branch, remove a test that depends on
/trunk features.

* subversion/tests/cmdline/svnadmin_tests.py
  (verify_invalid_path_changes): Drop. 
  (test_list): Update.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x-r1536854@1555517 13f79535-47bb-0310-9956-ffa450edef68