Make over 90% of the tests succeed with Python 3.
Make over 90% of the tests succeed with Python 3.

* subversion/tests/cmdline/svntest/main.py
  (filter_dbg): Program output may be either strings or binaries.
                Make filtering work in both cases.
  (run_command_stdin): Update caller.
  (copy_repos): Dump streams are binary.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1743081 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion