On the verify-keep-going branch, adjust expected output to make tests pass.

* subversion/tests/cmdline/svnadmin_tests.py
  (verify_keep_going, verify_invalid_path_changes): Tweak expected stdout
   and stderr to make these tests accept the current behaviour.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/verify-keep-going@1546052 13f79535-47bb-0310-9956-ffa450edef68