In the test suite, print out exceptions with logging level of WARNING, rather than ERROR.
In the test suite, print out exceptions with logging level of WARNING, rather
than ERROR.

* subversion/tests/cmdline/svntest/main.py
  (_log_exception): New helper.
  (TestRunner): Use the helper to emit exception contents.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1299972 13f79535-47bb-0310-9956-ffa450edef68

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