When displaying expected and actual output of a test failure, print the
lines via the logger object for consistency with other output, and prefix
them with an additional vertical bar for visual clarity.

* subversion/tests/cmdline/svntest/verify.py
  (display_lines): Print via the logger; add a '| ' prefix.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1443295 13f79535-47bb-0310-9956-ffa450edef68